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README.md

Master

A collection of awesome lists, manuals, blogs, hacks, one-liners, cli/web tools and more.

_{Created by
trimstray and

contributors}

» All suggestions are welcome «

What is it?

This list is a collection of various materials that I use every day in my work. It contain a lot of useful information gathered in one piece.

This is not a final and full version - I update it on an ongoing basis.

For whom?

It is intended for everyone and anyone - especially for system and network administrators, devops, pentesters or security researchers.

☑️ Todo

Add useful shell functions
Add one-liners for collection tools (eg. CLI Tools)
Generate book pdf format

The Book of Secret Knowledge (Chapters)

CLI Tools

▪️ Shells

  🔸 Oh My ZSH! - the best framework for managing your Zsh configuration.
  🔸 bash-it - framework for using, developing and maintaining shell scripts and custom commands for your daily work.
  🔸 Oh My Fish - the Fishshell framework.

▪️ Managers

  🔸 Midnight Commander - visual file manager, licensed under GNU General Public License.
  🔸 screen - full-screen window manager that multiplexes a physical terminal.
  🔸 tmux - terminal multiplexer, lets you switch easily between several programs in one terminal.
  🔸 tmux-cssh - sets a comfortable and easy to use functionality, clustering and synchronizing virtual tmux-sessions.

▪️ Network

  🔸 Curl - command line tool and library for transferring data with URLs.
  🔸 HTTPie - a user-friendly HTTP client.
  🔸 wuzz - interactive cli tool for HTTP inspection.
  🔸 httpstat - visualizes curl statistics in a way of beauty and clarity.
  🔸 gnutls-cli - client program to set up a TLS connection to some other computer.
  🔸 nmap - free and open source (license) utility for network discovery and security auditing.
  🔸 hping - command-line oriented TCP/IP packet assembler/analyzer.
  🔸 mtr - functionality of the 'traceroute' and 'ping' programs in a single network diagnostic tool.
  🔸 masscan - the fastest Internet port scanner, spews SYN packets asynchronously.
  🔸 netcat - networking utility which reads and writes data across network connections, using the TCP/IP protocol.
  🔸 tcpdump - powerful command-line packet analyzer.
  🔸 tshark - dump and analyze network traffic (wireshark cli).
  🔸 bmon - monitoring and debugging tool to capture networking related statistics and prepare them visually.
  🔸 fierce - a DNS reconnaissance tool for locating non-contiguous IP space.
  🔸 sublist3r - fast subdomains enumeration tool for penetration testers.
  🔸 amass - tool obtains subdomain names by scraping data sources, crawling web archives and more.
  🔸 namebench - provides personalized DNS server recommendations based on your browsing history.
  🔸 Nemesis - packet manipulation CLI tool; craft and inject packets of several protocols.
  🔸 packetfu - a mid-level packet manipulation library for Ruby.
  🔸 Scapy - packet manipulation library; forge, send, decode, capture packets of a wide number of protocols.
  🔸 bombardier - fast cross-platform HTTP benchmarking tool written in Go.
  🔸 gobench - http/https load testing and benchmarking tool.
  🔸 Nipe - script to make Tor Network your default gateway.
  🔸 iptraf-ng - is a console-based network monitoring program for Linux that displays information about IP traffic.
  🔸 aria2 - is a lightweight multi-protocol & multi-source command-line download utility.

▪️ SSL/Security

  🔸 sslyze - fast and powerful SSL/TLS server scanning library.
  🔸 sslscan - tests SSL/TLS enabled services to discover supported cipher suites.
  🔸 testssl.sh - testing TLS/SSL encryption anywhere on any port.
  🔸 spiped - is a utility for creating symmetrically encrypted and authenticated pipes between socket addresses.

▪️ Auditing Tools

  🔸 lynis - battle-tested security tool for systems running Linux, macOS, or Unix-based operating system.
  🔸 LinEnum - scripted Local Linux Enumeration & Privilege Escalation Checks.
  🔸 Rkhunter - scanner tool for Linux systems that scans backdoors, rootkits and local exploits on your systems.

▪️ System Diagnostics/Debuggers

  🔸 strace - diagnostic, debugging and instructional userspace utility for Linux.
  🔸 sysdig - system exploration and troubleshooting tool with first class support for containers.
  🔸 glances - cross-platform system monitoring tool written in Python.
  🔸 htop - interactive text-mode process viewer for Unix systems. It aims to be a better 'top'.
  🔸 atop - ASCII performance monitor. Includes statistics for CPU, memory, disk, swap, network, and processes.
  🔸 lsof - displays in its output information about files that are opened by processes.
  🔸 FlameGraph - stack trace visualizer.
  🔸 lsofgraph - small utility to convert Unix lsof output to a graph showing FIFO and UNIX interprocess communication.

▪️ Log Analyzers

🔸 GoAccess - real-time web log analyzer and interactive viewer that runs in a terminal.
🔸 ngxtop - real-time metrics for nginx server.

▪️ Databases

  🔸 usql - universal command-line interface for SQL databases.
  🔸 pgcli - postgres CLI with autocompletion and syntax highlighting.
  🔸 mycli - terminal client for MySQL with autocompletion and syntax highlighting.

▪️ Pentesting

  🔸 Metasploit - tool and framework for pentesting system, web and many more, contains a lot a ready to use exploit.
  🔸 Burp Suite - tool for testing Web application security, intercepting proxy to replay, inject, scan and fuzz HTTP requests.
  🔸 OWASP Zed Attack Proxy - intercepting proxy to replay, inject, scan and fuzz HTTP requests.
  🔸 Nikto2 - web server scanner which performs comprehensive tests against web servers for multiple items.
  🔸 sqlmap - tool that automates the process of detecting and exploiting SQL injection flaws.

▪️ Other

🔸 incron - is an inode-based filesystem notification technology.

Web Tools

▪️ SSL/Security

  🔸 SSL Server Test - free online service performs a deep analysis of the configuration of any SSL web server.
  🔸 SSL Server Test (DEV) - free online service performs a deep analysis of the configuration of any SSL web server.
  🔸 ImmuniWeb® SSLScan - test SSL/TLS (PCI DSS, HIPAA and NIST).
  🔸 urlscan.io - service to scan and analyse websites.
  🔸 Report URI - monitoring security policies like CSP and HPKP.
  🔸 CSP Evaluator - allows developers and security experts to check if a Content Security Policy.
  🔸 Useless CSP - public list about CSP in some big players (might make them care a bit more).
  🔸 Why No HTTPS? - list of the world's top 100 websites by Alexa rank not automatically redirecting insecure requests.
  🔸 cipherli.st - strong ciphers for Apache, Nginx, Lighttpd and more.
  🔸 badssl.com - memorable site for testing clients against bad SSL configs.
  🔸 tlsfun.de - registered for various tests regarding the TLS/SSL protocol.
  🔸 Common CA Database - repository of information about CAs, and their root and intermediate certificates.
  🔸 CERTSTREAM - real-time certificate transparency log update stream.
  🔸 crt.sh - discovers certificates by continually monitoring all of the publicly known CT.

▪️ Privacy

🔸 privacytools.io - provides knowledge and tools to protect your privacy against global mass surveillance.
🔸 DNS Privacy Test Servers - DNS privacy recursive servers list (with a 'no logging' policy).

▪️ HTTP Headers

  🔸 Security Headers - analyse the HTTP response headers (with rating system to the results).
  🔸 Observatory by Mozilla - set of tools to analyze your website.
  🔸 Enable CORS - enable cross-origin resource sharing.

▪️ DNS

  🔸 ViewDNS - one source for free DNS related tools and information.
  🔸 DNSlytics - online investigation tool.
  🔸 DNS Spy - monitor, validate and verify your DNS configurations.
  🔸 Find subdomains online - find subdomains for security assessment penetration test.
  🔸 DNSdumpster - dns recon & research, find & lookup dns records.
  🔸 DNS Table online - search for DNS records by domain, IP, CIDR, ISP.
  🔸 PTRarchive.com - this site is responsible for the safekeeping of historical reverse DNS records.
  🔸 xip.ip - wildcard DNS for everyone.

▪️ Mail

  🔸 MX Toolbox - all of your MX record, DNS, blacklist and SMTP diagnostics in one integrated tool.
  🔸 blacklistalert - checks to see if your domain is on a Real Time Spam Blacklist.
  🔸 MultiRBL - complete IP check for sending Mailservers.

▪️ PGP Keyservers

🔸 SKS OpenPGP Key server - includes a highly-efficient reconciliation algorithm for keeping the keyservers synchronized.

▪️ Mass scanners (search engines)

  🔸 Censys - platform that helps information security practitioners discover, monitor, and analyze devices.
  🔸 Shodan - the world's first search engine for Internet-connected devices.
  🔸 Shodan 2000 - if you use Shodan for everyday work, be sure to see it - looks for randomly generated data from Shodan.
  🔸 GreyNoise - mass scanner (such as Shodan and Censys).
  🔸 ZoomEye - search engine for cyberspace that lets the user find specific network components.
  🔸 FOFA - is a cyberspace search engine.
  🔸 onyphe - is a search engine for open-source and cyber threat intelligence data collected.
  🔸 binaryedge - it scan the entire internet space and create real-time threat intelligence streams and reports.
  🔸 hunter - lets you find email addresses in seconds and connect with the people that matter for your business.
  🔸 wigle - is a submission-based catalog of wireless networks. All the networks. Found by Everyone.
  🔸 PublicWWW - find any alphanumeric snippet, signature or keyword in the web pages HTML, JS and CSS code.
  🔸 IntelTechniques - this repository contains hundreds of online search utilities.
  🔸 GhostProject? - search by full email address or username.
  🔸 Buckets by Grayhatwarfar - database with public search for Open Amazon S3 Buckets and their contents.
  🔸 Vigilante.pw - the breached database directory.
  🔸 builtwith - find out what websites are built with.

▪️ Net-tools

  🔸 Netcraft - detailed report about the site, helping you to make informed choices about their integrity.
  🔸 RIPE NCC - not-for-profit membership association, a Regional Internet Registry and the secretariat for the RIPE.
  🔸 Robtex - uses various sources to gather public information about IP numbers, domain names, host names, routes etc.
  🔸 Security Trails - APIs for Security Companies, Researchers and Teams.
  🔸 Online Curl - curl test, analyze HTTP Response Headers.
  🔸 Ping.eu - online Ping, Traceroute, DNS lookup, WHOIS and others.
  🔸 Network-Tools - network tools for webmasters, IT technicians & geeks.
  🔸 URL Encode/Decode - tool from above to either encode or decode a string of text.
  🔸 Uncoder - the online translator for search queries on log data.
  🔸 XSS String Encoder - for generating XSS code to check your input validation filters against XSS.
  🔸 RegExr - online tool to learn, build, & test Regular Expressions (RegEx / RegExp).
  🔸 Hardenize - deploy the security standards.
  🔸 VirusTotal - analyze suspicious files and URLs to detect types of malware.

▪️ Code parsers/playgrounds

  🔸 ShellCheck - finds bugs in your shell scripts.
  🔸 jsbin - live pastebin for HTML, CSS & JavaScript and more.
  🔸 PHP Sandbox - test your PHP code with this code tester.

▪️ Performance

🔸 GTmetrix - analyze your site’s speed and make it faster.
🔸 Sucuri loadtimetester - test here the performance of any of your sites from across the globe.

▪️ Passwords

  🔸 Random.org - generate random passwords.
  🔸 Gotcha? - list of 1.4 billion accounts circulates around the Internet.
  🔸 have i been pwned? - check if you have an account that has been compromised in a data breach.

▪️ CVE

🔸 CVE Mitre - list of publicly known cybersecurity vulnerabilities.
🔸 CVE Details - CVE security vulnerability advanced database.

Manuals/Howtos/Tutorials

▪️ Bash

  🔸 pure-bash-bible - a collection of pure bash alternatives to external processes.
  🔸 The Bash Hackers Wiki - hold documentation of any kind about GNU Bash.
  🔸 Shell & Utilities - describes the commands and utilities offered to application programs by POSIX-conformant systems.

▪️ Programming

🔸 F’Awk Yeah! - advanced sed and awk usage (Parsing for Pentesters 3).

▪️ Unix & Network

  🔸 nixCraft - linux and unix tutorials for new and seasoned sysadmin.
  🔸 TecMint - the ideal Linux blog for Sysadmins & Geeks.
  🔸 Omnisecu - Free Networking, System Administration and Security Tutorials.
  🔸 Unix Toolbox - collection of Unix/Linux/BSD commands and tasks which are useful for IT work or for advanced users.

▪️ Security

  🔸 OWASP - worldwide not-for-profit charitable organization focused on improving the security of software.
  🔸 OWASP ASVS 3.0.1 - OWASP Application Security Verification Standard Project.
  🔸 OWASP ASVS 3.0.1 Web App - simple web app that helps developers understand the ASVS requirements.
  🔸 Offensive Security - true performance-based penetration testing training for over a decade.
  🔸 Hacking Articles - LRaj Chandel's Security & Hacking Blog.
  🔸 GTFOBins - list of Unix binaries that can be exploited by an attacker to bypass local security restrictions.
  🔸 AWS security tools - make your AWS cloud environment more secure.
  🔸 HTML5 Security Cheatsheet - a collection of HTML5 related XSS attack vectors.
  🔸 PTES - the penetration testing execution standard.
  🔸 ctf-tools - some setup scripts for security research tools.
  🔸 Guifre Ruiz Notes - collection of security, system, network and pentest cheatsheets.
  🔸 Rawsec's CyberSecurity Inventory - an inventory of tools and resources about CyberSecurity.
  🔸 Application Security Wiki - is an initiative to provide all application security related resources at one place.
  🔸 The Illustrated TLS Connection - every byte of a TLS connection explained and reproduced.

▪️ Web Apps

🔸 Mozilla Web Security - help operational teams with creating secure web applications.

▪️ Other

  🔸 CTF Series : Vulnerable Machines - the steps below could be followed to find vulnerabilities and exploits.
  🔸 How to start RE/malware analysis? - collection of some hints and useful links for the beginners.
  🔸 LZone Cheat Sheets - all cheat sheets.
  🔸 Dan’s Cheat Sheets’s - massive cheat sheets documentation.
  🔸 The C10K problem - it's time for web servers to handle ten thousand clients simultaneously, don't you think?
  🔸 Bank Grade Security - when companies say they have "Bank Grade Security" they imply that it is a good thing.
  🔸 HTTPS on Stack Overflow - this is the story of a long journey regarding the implementation of SSL.
  🔸 Julia's Drawings - some drawings about programming and unix world, zines about systems & debugging tools.
  🔸 DEF CON Media Server - great stuff from DEFCON 26.
  🔸 BGP Meets Cat - after 3072 hours of manipulating BGP, Job Snijders has succeeded in drawing a Nyancat.
  🔸 HTTPS in the real world - great tutorial explain how HTTPS works in the real world.

Blogs

  🔸 Brendan Gregg's Blog - Brendan Gregg is an industry expert in computing performance and cloud computing.
  🔸 Gynvael "GynDream" Coldwind - Gynvael is a IT security engineer at Google.
  🔸 Michał "lcamtuf" Zalewski - "white hat" hacker, computer security expert.
  🔸 Mattias Geniar - developer, Sysadmin, Blogger, Podcaster and Public Speaker.
  🔸 Nick Craver - Software Developer and Systems Administrator for Stack Exchange.
  🔸 Robert Penz - IT security Expert.
  🔸 Scott Helme - Security Researcher, international speaker and founder of securityheaders.com and report-uri.com.
  🔸 Kacper Szurek - Detection Engineer at ESET.
  🔸 Troy Hunt - Microsoft Regional Director and Microsoft Most Valuable Professional for Developer Security.
  🔸 Linux Audit - the Linux security blog about Auditing, Hardening and Compliance by Michael Boelen.
  🔸 Linux Security Expert - trainings, howtos, checklists, security tools and more.
  🔸 The Grymoire - collection of useful incantations for wizards, be you computer wizards, magicians, or whatever.
  🔸 raymii.org - linux/unix sysadmin specializing in building high availability cloud environments.

▪️ A piece of history

🔸 How to Do Things at ARL - how to configure modems, scan images, record CD-ROMs, and other useful techniques.

Systems/Services

▪️ Systems

  🔸 Slackware - the most "Unix-like" Linux distribution.
  🔸 OpenBSD - multi-platform 4.4BSD-based UNIX-like operating system.
  🔸 HardenedBSD - HardenedBSD aims to implement innovative exploit mitigation and security solutions.
  🔸 Kali Linux - Linux distribution used for Penetration Testing, Ethical Hacking and network security assessments.
  🔸 Backbox Linux - penetration test and security assessment oriented Ubuntu-based Linux distribution.

▪️ HTTP(s) Services

🔸 Varnish HTTP Cache - HTTP accelerator designed for content-heavy dynamic web sites.
🔸 Nginx - open source web and reverse proxy server that is similar to Apache, but very light weight.

▪️ Security/hardening

  🔸 Emerald Onion - seattle-based encrypted-transit internet service provider.
  🔸 Unbound - validating, recursive, and caching DNS resolver (with TLS).
  🔸 Knot Resolver - caching full resolver implementation, including both a resolver library and a daemon.
  🔸 Vulnreport - open-source pentesting management and automation platform by Salesforce Product Security.

Networks

▪️ Tools

🔸 CapAnalysis - web visual tool to analyze large amounts of captured network traffic (PCAP analyzer).

▪️ Labs

🔸 NRE Labs - learn automation by doing it. Right now, right here, in your browser.

Awesome Lists

  🔸 Awesome Sysadmin - amazingly awesome open source sysadmin resources.
  🔸 Awesome Shell - awesome command-line frameworks, toolkits, guides and gizmos.
  🔸 Awesome Hacking - awesome lists for hackers, pentesters and security researchers.
  🔸 Awesome Hacking Resources - collection of hacking/penetration testing resources to make you better.
  🔸 Hacking Cheat Sheet - author hacking and pentesting notes.
  🔸 Movies for Hackers - list of movies every hacker & cyberpunk must watch.
  🔸 Awesome Pentest - collection of awesome penetration testing resources, tools and other shiny things.
  🔸 Awesome Pcaptools - collection of tools developed by other researchers to process network traces.
  🔸 SecLists - collection of multiple types of lists used during security assessments, collected in one place.
  🔸 Command-line-text-processing - from finding text to search and replace, from sorting to beautifying text and more.
  🔸 Awesome Scalability - best practices in building High Scalability, High Availability, High Stability and more.
  🔸 Awesome Postgres - list of awesome PostgreSQL software, libraries, tools and resources.
  🔸 Free Security eBooks - list of a Free Security and Hacking eBooks.

Hacking/Penetration Testing

▪️ Pentests bookmarks collection

  🔸 Brute XSS - master the art of Cross Site Scripting.
  🔸 Offensive Security Bookmarks - security bookmarks collection, all that things I need to pass OSCP.
  🔸 Awesome Pentest Cheat Sheets - collection of the cheat sheets useful for pentesting.
  🔸 Pentest Bookmarks - there are a LOT of pentesting blogs.
  🔸 PayloadsAllTheThings - a list of useful payloads and bypass for Web Application Security and Pentest/CTF.
  🔸 Penetration Testing Tools Cheat Sheet - a quick reference high level overview for typical penetration testing engagements.
  🔸 SQL Injection Cheat Sheet - detailed technical information about the many different variants of the SQL Injection.

▪️ Bounty programs

  🔸 Bounty Factory - European bug bounty platform based on the legislation and rules in force in European countries.
  🔸 Openbugbounty - allows any security researcher reporting a vulnerability on any website.
  🔸 hackerone - global hacker community to surface the most relevant security issues.
  🔸 bugcrowd - crowdsourced cybersecurity for the enterprise.
  🔸 Crowdshield - crowdsourced Security & Bug Bounty Management.

▪️ Web Training Apps (local installation)

  🔸 OWASP-VWAD - comprehensive and well maintained registry of all known vulnerable web applications.
  🔸 Metasploitable 2 - vulnerable web application amongst security researchers.
  🔸 DVWA - PHP/MySQL web application that is damn vulnerable.
  🔸 OWASP Mutillidae II - free, open source, deliberately vulnerable web-application.
  🔸 OWASP Juice Shop Project - the most bug-free vulnerable application in existence.
  🔸 OWASP WebGoat Project - insecure web application maintained by OWASP designed to teach web app security.
  🔸 Security Ninjas - open source application security training program.
  🔸 hackazon - a modern vulnerable web app.
  🔸 dvna - damn vulnerable NodeJS application.
  🔸 Google Gruyere - web application exploits and defenses.
  🔸 Bodhi - is a playground focused on learning the exploitation of client-side web vulnerabilities.

▪️ Labs (ethical hacking platforms)

  🔸 Hack The Box - online platform allowing you to test your penetration testing skills.
  🔸 Hacking-Lab - online ethical hacking, computer network and security challenge platform.
  🔸 pwnable.kr - non-commercial wargame site which provides various pwn challenges regarding system exploitation.
  🔸 Pwnable.tw - is a wargame site for hackers to test and expand their binary exploiting skills.
  🔸 Silesia Security Lab - high quality security testing services.
  🔸 Practical Pentest Labs - pentest lab, take your Hacking skills to the next level.
  🔸 Root Me - the fast, easy, and affordable way to train your hacking skills.
  🔸 rozwal.to - a great platform to train your pentesting skills.
  🔸 TryHackMe - learning Cyber Security made easy.
  🔸 OverTheWire - can help you to learn and practice security concepts in the form of fun-filled games.

Your daily knowledge and news

▪️ RSS Readers

🔸 Feedly - organize, read and share what matters to you.

▪️ Security

  🔸 Google Online Security Blog - the latest news and insights from Google on security and safety on the Internet.
  🔸 Qualys Blog - expert network security guidance and news.
  🔸 DARKReading - connecting the Information Security Community.
  🔸 publiclyDisclosed - public disclosure watcher who keeps you up to date about the recently disclosed bugs.
  🔸 0day.today - exploits market provides you the possibility to buy zero-day exploits and also to sell 0day exploits.
  🔸 Exploit-DB - the exploit database: exploits, shellcode, 0days, remote exploits, local exploits, web Apps and more.
  🔸 sploitus - the exploit and tools database.
  🔸 Packet Storm - information security services, news, files, tools, exploits, aAdvisories and whitepapers.
  🔸 Sekurak - about security, penetration tests, vulnerabilities and many others (PL/EN).
  🔸 nf.sec - basic aspects and mechanisms of Linux operating system security (PL).

Other Cheat Sheets

DNS Servers list (privacy)

IP	URL
`84.200.69.80`	dns.watch
`94.247.43.254`	opennic.org
`64.6.64.6`	verisign.com
`89.233.43.71`	censurfridns.dk
`1.1.1.1`	cloudflare.com
`94.130.110.185`	dnsprivacy.at

Build your own DNS Servers

  🔸 Unbound DNS Tutorial - a validating, recursive, and caching DNS server.
  🔸 Knot Resolver on Fedora - how to get faster and more secure DNS resolution with Knot Resolver on Fedora.
  🔸 DNS-over-HTTPS - tutorial to setup your own DNS-over-HTTPS (DoH) server.
  🔸 DNS Servers - how (and why) i run my own DNS Servers.
  🔸 DNS Privacy Server - running your own DoT or DoH server this page provides some ideas.

One-liners

System
- terminal
- mount
- fuser
- ps
- top
- strace
- kill
- find
- diff
- tail
- cpulimit
- pwdx
- tr
- chmod
- who
- screen
- du
- inotifywait
- openssl
- gnutls-cli
- secure-delete
- dd
HTTP/HTTPS
- curl
- httpie
Network
- ssh
- linux-dev
- tcpdump
- tcpick
- ngrep
- hping3
- netcat
- socat
- lsof
- netstat
- rsync
- host
- dig
- network-other
Programming
- awk
- sed
- grep

System

Tool: terminal

Reload shell without exit

exec $SHELL -l

Close shell keeping all subprocess running

disown -a && exit

Exit without saving shell history

kill -9 $$
unset HISTFILE && exit

Perform a branching conditional

true && echo success
false || echo failed

Pipe stdout and stderr to separate commands

some_command > >(/bin/cmd_for_stdout) 2> >(/bin/cmd_for_stderr)

Redirect stdout and stderr each to separate files and print both to the screen

(some_command 2>&1 1>&3 | tee errorlog ) 3>&1 1>&2 | tee stdoutlog

List of commands you use most often

history | \
awk '{CMD[$2]++;count++;}END { for (a in CMD)print CMD[a] " " CMD[a]/count*100 "% " a;}' | \
grep -v "./" | \
column -c3 -s " " -t | \
sort -nr | nl |  head -n 20

Quickly backup a file

cp filename{,.orig}

Empty a file (truncate to 0 size)

>filename

Delete all files in a folder that don’t match a certain file extension

rm !(*.foo|*.bar|*.baz)

Pass multi-line string to a file

# cat  >filename ... - overwrite file
# cat >>filename ... - append to file
cat > filename << __EOF__
data data data
__EOF__

Edit a file on a remote host using vim

vim scp://user@host//etc/fstab

Create a directory and change into it at the same time

mkd () { mkdir -p "$@" && cd "$@"; }

Convert uppercase files to lowercase files

rename 'y/A-Z/a-z/' *

Print a row of characters across the terminal

printf "%`tput cols`s" | tr ' ' '#'

Show shell history without line numbers

history | cut -c 8-
fc -l -n 1 | sed 's/^\s*//'

Run command(s) after exit session

cat > /etc/profile << __EOF__
_after_logout() {

  username=$(whoami)

  for _pid in $(ps afx | grep sshd | grep "$username" | awk '{print $1}') ; do

    kill -9 $_pid

  done

}
trap _after_logout EXIT
__EOF__

Generate a sequence of numbers

for ((i=1; i<=10; i+=2)) ; do echo $i ; done
# alternative: seq 1 2 10

for ((i=5; i<=10; ++i)) ; do printf '%02d\n' $i ; done
# alternative: seq -w 5 10

Tool: mount

Mount a temporary ram partition

mount -t tmpfs tmpfs /mnt -o size=64M

-t - filesystem type
-o - mount options

Remount a filesystem as read/write

mount -o remount,rw /

Tool: fuser

Kills a process that is locking a file

fuser -k filename

Show what PID is listening on specific port

fuser -v 53/udp

Tool: ps

Show a 4-way scrollable process tree with full details

ps awwfux | less -S

Processes per user counter

ps hax -o user | sort | uniq -c | sort -r

Tool: find

Find files that have been modified on your system in the past 60 minutes

find / -mmin 60 -type f

Find all files larger than 20M

find / -type f -size +20M

Find duplicate files (based on MD5 hash)

find -type f -exec md5sum '{}' ';' | sort | uniq --all-repeated=separate -w 33

Change permission only for files

cd /var/www/site && find . -type f -exec chmod 766 {} \;
cd /var/www/site && find . -type f -exec chmod 664 {} +

Change permission only for directories

cd /var/www/site && find . -type d -exec chmod g+x {} \;
cd /var/www/site && find . -type d -exec chmod g+rwx {} +

Find files and directories for specific user

find . -user <username> -print

Find files and directories for all without specific user

find . \!-user <username> -print

Delete older files than 60 days

find . -type f -mtime +60 -delete

Recursively remove all empty sub-directories from a directory

find . -depth  -type d  -empty -exec rmdir {} \;

How to find all hard links to a file

find </path/to/dir> -xdev -samefile filename

Recursively find the latest modified files

find . -type f -exec stat --format '%Y :%y %n' "{}" \; | sort -nr | cut -d: -f2- | head

Tool: top

Use top to monitor only all processes with the specific string

top -p $(pgrep -d , <str>)

<str> - process containing str (eg. nginx, worker)

Tool: strace

Track the open request of a network port

strace -f -e trace=bind nc -l 80

Track the open request of a network port (show TCP/UDP)

strace -f -e trace=network nc -lu 80

Tool: kill

Kill a process running on port

kill -9 $(lsof -i :<port> | awk '{l=$2} END {print l}')

Tool: diff

Compare two directory trees

diff <(cd directory1 && find | sort) <(cd directory2 && find | sort)

Tool: tail

Annotate tail -f with timestamps

tail -f file | while read ; do echo "$(date +%T.%N) $REPLY" ; done

Analyse an Apache access log for the most common IP addresses

tail -10000 access_log | awk '{print $1}' | sort | uniq -c | sort -n | tail

Analyse web server log and show only 5xx http codes

tail -n 100 -f /path/to/logfile | grep "HTTP/[1-2].[0-1]\" [5]"

Tool: tar

System backup with exclude specific directories

cd /
tar -czvpf /mnt/system$(date +%d%m%Y%s).tgz --directory=/ \
--exclude=proc/* --exclude=sys/* --exclude=dev/* --exclude=mnt/* .

System backup with exclude specific directories (pigz)

cd /
tar cvpf /backup/snapshot-$(date +%d%m%Y%s).tgz --directory=/ \
--exclude=proc/* --exclude=sys/* --exclude=dev/* \
--exclude=mnt/* --exclude=tmp/* --use-compress-program=pigz .

Tool: dump

System backup to file

dump -y -u -f /backup/system$(date +%d%m%Y%s).lzo /

Restore system from lzo file

cd /
restore -rf /backup/system$(date +%d%m%Y%s).lzo

Tool: cpulimit

Limit the cpu usage of a process

cpulimit -p pid -l 50

Tool: pwdx

Show current working directory of a process

pwdx <pid>

Tool: taskset

Start a command on only one CPU core

taskset -c 0 <command>

Tool: tr

Show directories in the PATH, one per line

tr : '\n' <<<$PATH

Tool: chmod

Remove executable bit from all files in the current directory

chmod -R -x+X *

Restore permission for /bin/chmod

# 1:
cp /bin/ls chmod.01
cp /bin/chmod chmod.01
./chmod.01 700 file

# 2:
/bin/busybox chmod 0700 /bin/chmod

# 3:
setfacl --set u::rwx,g::---,o::--- /bin/chmod

Tool: who

Find last reboot time

who -b

Tool: screen

Start screen in detached mode

screen -d -m [<command>]

Tool: du

Show 20 biggest directories with ‘K M G’

du | \
sort -r -n | \
awk '{split("K M G",v); s=1; while($1>1024){$1/=1024; s++} print int($1)" "v[s]"\t"$2}' | \
head -n 20

Tool: inotifywait

Init tool everytime a file in a directory is modified

while true ; do inotifywait -r -e MODIFY dir/ && ls dir/ ; done;

Tool: openssl

Testing connection to remote host

echo | openssl s_client -connect google.com:443 -showcerts

Testing connection to remote host (with SNI support)

echo | openssl s_client -showcerts -servername google.com -connect google.com:443

Testing connection to remote host with specific ssl version

openssl s_client -tls1_2 -connect google.com:443

Testing connection to remote host with specific ssl cipher

openssl s_client -cipher 'AES128-SHA' -connect google.com:443

Generate private key

# _ciph: des3, aes
( _ciph="des3" ; _fd="private.key" ; _len="2048" ; \
openssl genrsa -${_ciph} -out ${_fd} ${_len} )

Remove password from private key

( _fd="private.key" ; _fd_unp="private_unp.key" ; \
openssl rsa -in ${_fd} -out ${_fd_unp} )

Get public key from private key

( _fd="private.key" ; _fd_pub="public.key" ; \
openssl rsa -pubout -in ${_fd} -out ${_fd_pub} )

Generate private key + csr

( _fd="private.key" ; _fd_csr="request.csr" ; _len="2048" ; \
openssl req -out ${_fd_csr} -new -newkey rsa:${_len} -nodes -keyout ${_fd} )

Generate csr

( _fd="private.key" ; _fd_csr="request.csr" ; \
openssl req -out ${_fd_csr} -new -key ${_fd} )

Generate csr (metadata from exist certificate)

( _fd="private.key" ; _fd_csr="request.csr" ; _fd_crt="cert.crt" ; \
openssl x509 -x509toreq -in ${_fd_crt} -out ${_fd_csr} -signkey ${_fd} )

Generate csr with -config param

( _fd="private.key" ; _fd_csr="request.csr" ; \
openssl req -new -sha256 -key ${_fd} -out ${_fd_csr} \
-config <(
cat <<-EOF
[req]
default_bits = 2048
prompt = no
default_md = sha256
req_extensions = req_ext
distinguished_name = dn

[ dn ]
C=<two-letter ISO abbreviation for your country>
ST=<state or province where your organization is legally located>
L=<city where your organization is legally located>
O=<legal name of your organization>
OU=<section of the organization>
CN=<fully qualified domain name>

[ req_ext ]
subjectAltName = @alt_names

[ alt_names ]
DNS.1 = <fully qualified domain name>
DNS.2 = <next domain>
DNS.3 = <next domain>
EOF
))

Convert DER to PEM

( _fd_der="cert.crt" ; _fd_pem="cert.pem" ; \
openssl x509 -in ${_fd_der} -inform der -outform pem -out ${_fd_pem} )

Convert PEM to DER

( _fd_der="cert.crt" ; _fd_pem="cert.pem" ; \
openssl x509 -in ${_fd_pem} -outform der -out ${_fd_der} )

Checking whether the private key and the certificate match

(openssl rsa -noout -modulus -in private.key | openssl md5 ; openssl x509 -noout -modulus -in certificate.crt | openssl md5) | uniq

Tool: gnutls-cli

Testing connection to remote host (with SNI support)

gnutls-cli -p 443 google.com

Testing connection to remote host (without SNI support)

gnutls-cli --disable-sni -p 443 google.com

Tool: secure-delete

Secure delete with shred

shred -vfuz -n 10 file
shred --verbose --random-source=/dev/urandom -n 1 /dev/sda

Secure delete with scrub

scrub -p dod /dev/sda
scrub -p dod -r file

Secure delete with badblocks

badblocks -s -w -t random -v /dev/sda
badblocks -c 10240 -s -w -t random -v /dev/sda

Secure delete with secure-delete

srm -vz /tmp/file
sfill -vz /local
sdmem -v
swapoff /dev/sda5 && sswap -vz /dev/sda5

Tool: dd

Show dd status every so often

dd <dd_params> status=progress
watch --interval 5 killall -USR1 dd

Redirect output to a file with dd

echo "string" | dd of=filename

HTTP/HTTPS

Tool: curl

curl -Iks https://www.google.com

-I - show response headers only
-k - insecure connection when using ssl
-s - silent mode (not display body)

curl -Iks --location -X GET -A "x-agent" https://www.google.com

--location - follow redirects
-X - set method
-A - set user-agent

curl -Iks --location -X GET -A "x-agent" --proxy http://127.0.0.1:16379 https://www.google.com

--proxy [socks5://|http://] - set proxy server

Check DNS and HTTP trace with headers for specific domains

### Set domains and external dns servers.
_domain_list=(google.com) ; _dns_list=("8.8.8.8" "1.1.1.1")

for _domain in "${_domain_list[@]}" ; do

  printf '=%.0s' {1..48}

  echo

  printf "[\\e[1;32m+\\e[m] resolve: %s\\n" "$_domain"

  for _dns in "${_dns_list[@]}" ; do

    # Resolve domain.
    host "${_domain}" "${_dns}"

    echo

  done

  for _proto in http https ; do

    printf "[\\e[1;32m+\\e[m] trace + headers: %s://%s\\n" "$_proto" "$_domain"

    # Get trace and http headers.
    curl -Iks -A "x-agent" --location "${_proto}://${_domain}"

    echo

  done

done

unset _domain_list _dns_list

Tool: httpie

http -p Hh https://www.google.com

-p - print request and response headers
- H - request headers
- B - request body
- h - response headers
- b - response body

http -p Hh --follow --max-redirects 5 --verify no https://www.google.com

-F, --follow - follow redirects
--max-redirects N - maximum for --follow
--verify no - skip SSL verification

http -p Hh --follow --max-redirects 5 --verify no --proxy http:http://127.0.0.1:16379 https://www.google.com

--proxy [http:] - set proxy server

Network

Tool: ssh

Compare a remote file with a local file

ssh user@host cat /path/to/remotefile | diff /path/to/localfile -

SSH connection through host in the middle

ssh -t reachable_host ssh unreachable_host

Run command over ssh on remote host

cat > cmd.txt << __EOF__
cat /etc/hosts
__EOF__

ssh host -l user $(<cmd.txt)

Get public key from private key

ssh-keygen -y -f ~/.ssh/id_rsa

Get all fingerprints

ssh-keygen -l -f .ssh/known_hosts

Ssh authentication with user password

ssh -o PreferredAuthentications=password -o PubkeyAuthentication=no user@remote_host

Ssh authentication with publickey

ssh -o PreferredAuthentications=publickey -o PubkeyAuthentication=yes -i id_rsa user@remote_host

Simple recording SSH session

function _ssh_sesslog() {

  _sesdir="<path/to/session/logs>"

  mkdir -p "${_sesdir}" && \
  ssh $@ 2>&1 | tee -a "${_sesdir}/$(date +%Y%m%d).log"

}

# Alias:
alias ssh='_ssh_sesslog'

Using Keychain for SSH logins

### Delete all of ssh-agent's keys.
function _scl() {

  /usr/bin/keychain --clear

}

### Add key to keychain.
function _scg() {

  /usr/bin/keychain /path/to/private-key
  source "$HOME/.keychain/$HOSTNAME-sh"

}

Tool: linux-dev

Testing remote connection to port

timeout 1 bash -c "</dev/<proto>/<host>/<port>" >/dev/null 2>&1 ; echo $?

<proto - set protocol (tcp/udp)
<host> - set remote host
<port> - set destination port

Read and write to TCP or UDP sockets with common bash tools

exec 5<>/dev/tcp/<host>/<port>; cat <&5 & cat >&5; exec 5>&-

Tool: tcpdump

tcpdump -ne -i eth0 -Q in host 192.168.252.1 and port 443

-n - don’t convert addresses
-e - print the link-level headers
-i [iface|any] - set interface
-Q|-D [in|out|inout] - choose send/receive direction (-D - for old tcpdump versions)
host [ip|hostname] - set host, also [host not]
[and|or] - set logic
port [1-65535] - set port number, also [port not]

tcpdump -ne -i eth0 -Q in host 192.168.252.1 and port 443 -c 5 -w tcpdump.pcap

-c [num] - capture only num number of packets
-w [filename] - write packets to file, -r [filename] - reading from file

Tool: tcpick

Analyse packets in real-time

while true ; do tcpick -a -C -r dump.pcap ; sleep 2 ; clear ; done

Tool: ngrep

ngrep -d eth0 "www.google.com" port 443

-d [iface|any] - set interface
[domain] - set hostname
port [1-65535] - set port number

ngrep -d eth0 "www.google.com" (host 10.240.20.2) and (port 443)

(host [ip|hostname]) - filter by ip or hostname
(port [1-65535]) - filter by port number

ngrep -d eth0 -qt -O ngrep.pcap "www.google.com" port 443

-q - quiet mode (only payloads)
-t - added timestamps
-O [filename] - save output to file, -I [filename] - reading from file

ngrep -d eth0 -qt 'HTTP' 'tcp'

HTTP - show http headers
tcp|udp - set protocol
[src|dst] host [ip|hostname] - set direction for specific node

ngrep -l -q -d eth0 -i "User-Agent: curl*"

-l - stdout line buffered
-i - case-insensitive search

Tool: hping3

hping3 -V -p 80 -s 5050 <scan_type> www.google.com

-V|--verbose - verbose mode
-p|--destport - set destination port
-s|--baseport - set source port
<scan_type> - set scan type
- -F|--fin - set FIN flag, port open if no reply
- -S|--syn - set SYN flag
- -P|--push - set PUSH flag
- -A|--ack - set ACK flag (use when ping is blocked, RST response back if the port is open)
- -U|--urg - set URG flag
- -Y|--ymas - set Y unused flag (0x80 - nullscan), port open if no reply
- -M 0 -UPF - set TCP sequence number and scan type (URG+PUSH+FIN), port open if no reply

hping3 -V -c 1 -1 -C 8 www.google.com

-c [num] - packet count
-1 - set ICMP mode
-C|--icmptype [icmp-num] - set icmp type (default icmp-echo = 8)

hping3 -V -c 1000000 -d 120 -S -w 64 -p 80 --flood --rand-source <remote_host>

--flood - sent packets as fast as possible (don’t show replies)
--rand-source - random source address mode
-d --data - data size
-w|--win - winsize (default 64)

Tool: netcat

nc -kl 5000

-l - listen for an incoming connection
-k - listening after client has disconnected
>filename.out - save receive data to file (optional)

nc 192.168.0.1 5051 < filename.in

< filename.in - send data to remote host

nc -vz 10.240.30.3 5000

-v - verbose output
-z - scan for listening daemons

nc -vzu 10.240.30.3 1-65535

-u - scan only udp ports

Transfer data file (archive)

server> nc -l 5000 | tar xzvfp -
client> tar czvfp - /path/to/dir | nc 10.240.30.3 5000

Launch remote shell

server> nc -l 5000 -e /bin/bash
client> nc 10.240.30.3 5000

Simple file server

while true ; do nc -l 5000 | tar -xvf - ; done

Simple minimal HTTP Server

while true ; do nc -l -p 1500 -c 'echo -e "HTTP/1.1 200 OK\n\n $(date)"' ; done

Simple HTTP Server

Restarts web server after each request - remove while condition for only single connection.

cat > index.html << __EOF__
<!doctype html>
    <head>
        <meta charset="utf-8">
        <meta http-equiv="X-UA-Compatible" content="IE=edge,chrome=1">
        <title></title>
        <meta name="description" content="">
        <meta name="viewport" content="width=device-width, initial-scale=1">
    </head>
    <body>

    <p>

      Hello! It's a site.

    </p>

    </body>
</html>
__EOF__

server> while : ; do \
(echo -ne "HTTP/1.1 200 OK\r\nContent-Length: $(wc -c <index.html)\r\n\r\n" ; cat index.html;) | \
nc -l -p 5000 \
; done

-p - port number

Simple HTTP Proxy (single connection)

#!/usr/bin/env bash

if [[ $# != 2 ]] ; then
  printf "%s\\n" \
         "usage: ./nc-proxy listen-port bk_host:bk_port"
fi

_listen_port="$1"
_bk_host=$(echo "$2" | cut -d ":" -f1)
_bk_port=$(echo "$2" | cut -d ":" -f2)

printf "  lport: %s\\nbk_host: %s\\nbk_port: %s\\n\\n" \
       "$_listen_port" "$_bk_host" "$_bk_port"

_tmp=$(mktemp -d)
_back="$_tmp/pipe.back"
_sent="$_tmp/pipe.sent"
_recv="$_tmp/pipe.recv"

trap 'rm -rf "$_tmp"' EXIT

mkfifo -m 0600 "$_back" "$_sent" "$_recv"

sed "s/^/=> /" <"$_sent" &
sed "s/^/<=  /" <"$_recv" &

nc -l -p "$_listen_port" <"$_back" | \
tee "$_sent" | \
nc "$_bk_host" "$_bk_port" | \
tee "$_recv" >"$_back"

server> chmod +x nc-proxy && ./nc-proxy 8080 192.168.252.10:8000
  lport: 8080
bk_host: 192.168.252.10
bk_port: 8000

client> http -p h 10.240.30.3:8080
HTTP/1.1 200 OK
Accept-Ranges: bytes
Cache-Control: max-age=31536000
Content-Length: 2748
Content-Type: text/html; charset=utf-8
Date: Sun, 01 Jul 2018 20:12:08 GMT
Last-Modified: Sun, 01 Apr 2018 21:53:37 GMT

Create a single-use TCP or UDP proxy

### TCP -> TCP
nc -l -p 2000 -c "nc [ip|hostname] 3000"

### TCP -> UDP
nc -l -p 2000 -c "nc -u [ip|hostname] 3000"

### UDP -> UDP
nc -l -u -p 2000 -c "nc -u [ip|hostname] 3000"

### UDP -> TCP
nc -l -u -p 2000 -c "nc [ip|hostname] 3000"

Tool: socat

Testing remote connection to port

socat - TCP4:10.240.30.3:22

- - standard input (STDIO)
TCP4:<params> - set tcp4 connection with specific params
- [hostname|ip] - set hostname/ip
- [1-65535] - set port number

Redirecting TCP-traffic to a UNIX domain socket under Linux

socat TCP-LISTEN:1234,bind=127.0.0.1,reuseaddr,fork,su=nobody,range=127.0.0.0/8 UNIX-CLIENT:/tmp/foo

TCP-LISTEN:<params> - set tcp listen with specific params
- [1-65535] - set port number
- bind=[hostname|ip] - set bind hostname/ip
- reuseaddr - allows other sockets to bind to an address
- fork - keeps the parent process attempting to produce more connections
- su=nobody - set user
- range=[ip-range] - ip range
UNIX-CLIENT:<params> - communicates with the specified peer socket
- filename - define socket

Tool: lsof

Show process that use internet connection at the moment

lsof -P -i -n

Show process that use specific port number

lsof -i tcp:443

Lists all listening ports together with the PID of the associated process

lsof -Pan -i tcp -i udp

List all open ports and their owning executables

lsof -i -P | grep -i "listen"

Show all open ports

lsof -Pnl -i

Show open ports (LISTEN)

lsof -Pni4 | grep LISTEN | column -t

List all files opened by a particular command

lsof -c "process"

View user activity per directory

lsof -u username -a +D /etc

Show 10 Largest Open Files

lsof / | \
awk '{ if($7 > 1048576) print $7/1048576 "MB" " " $9 " " $1 }' | \
sort -n -u | tail | column -t

Tool: netstat

Graph # of connections for each hosts

netstat -an | \
grep ESTABLISHED | \
awk '{print $5}' | \
awk -F: '{print $1}' | \
grep -v -e '^[[:space:]]*$' | \
sort | uniq -c | \
awk '{ printf("%s\t%s\t",$2,$1) ; for (i = 0; i < $1; i++) {printf("*")}; print "" }'

Monitor open connections for specific port including listen, count and sort it per IP

watch "netstat -plan | grep :443 | awk {'print \$5'} | cut -d: -f 1 | sort | uniq -c | sort -nk 1"

Tool: rsync

Rsync remote data as root using sudo

rsync --rsync-path 'sudo rsync' username@hostname:/path/to/dir/ /local/

Tool: host

Resolves the domain name (using external dns server)

host google.com 9.9.9.9

Checks the domain administrator (SOA record)

host -t soa google.com 9.9.9.9

Tool: dig

Resolves the domain name (short output)

dig google.com +short

Lookup NS record for specific domain

dig @9.9.9.9 google.com NS

Query only answer section

dig google.com +nocomments +noquestion +noauthority +noadditional +nostats

Query ALL DNS Records

dig google.com ANY +noall +answer

DNS Reverse Look-up

dig -x 172.217.16.14 +short

Tool: network-other

Get all subnets for specific AS (Autonomous system)

AS="AS32934"
whois -h whois.radb.net -- "-i origin ${AS}" | \
grep "^route:" | \
cut -d ":" -f2 | \
sed -e 's/^[ \t]//' | \
sort -n -t . -k 1,1 -k 2,2 -k 3,3 -k 4,4 | \
cut -d ":" -f2 | \
sed -e 's/^[ \t]/allow /' | \
sed 's/$/;/' | \
sed 's/allow  */subnet -> /g'

Resolves domain name from dns.google.com with curl and jq

_dname="google.com" ; curl -s "https://dns.google.com/resolve?name=${_dname}&type=A" | jq .

Programming

Tool: awk

Remove duplicate entries in a file without sorting

awk '!x[$0]++' filename

Exclude multiple columns using AWK

awk '{$1=$3=""}1' filename

Tool: sed

To print a specific line from a file

sed -n 10p /path/to/file

Remove a specific line from a file

sed -i 10d /path/to/file
# alternative (BSD): sed -i'' 10d /path/to/file

Remove a range of lines from a file

sed -i <file> -re '<start>,<end>d'

Tool: grep

Search for a “pattern” inside all files in the current directory

grep -rn "pattern"
grep -RnisI "pattern" *
fgrep "pattern" * -R

Remove blank lines from a file and save output to new file

grep . filename > newfilename

Except multiple patterns

grep -vE '(error|critical|warning)' filename

Show data from file without comments

grep -v ^[[:space:]]*# filename

Show data from file without comments and new lines

egrep -v '#|^$' filename

README.md

A collection of awesome lists, manuals, blogs, hacks, one-liners, cli/web tools and more.

What is it?

For whom?

☑️ Todo

The Book of Secret Knowledge (Chapters)

CLI Tools

▪️ Shells

▪️ Managers

▪️ Network

▪️ SSL/Security

▪️ Auditing Tools

▪️ System Diagnostics/Debuggers

▪️ Log Analyzers

▪️ Databases

▪️ Pentesting

▪️ Other

Web Tools

▪️ SSL/Security

▪️ Privacy

▪️ HTTP Headers

▪️ DNS

▪️ Mail

▪️ PGP Keyservers

▪️ Mass scanners (search engines)

▪️ Net-tools

▪️ Code parsers/playgrounds

▪️ Performance

▪️ Passwords

▪️ CVE

Manuals/Howtos/Tutorials

▪️ Bash

▪️ Programming

▪️ Unix & Network

▪️ Security

▪️ Web Apps

▪️ Other

Blogs

▪️ A piece of history

Systems/Services

▪️ Systems

▪️ HTTP(s) Services

▪️ Security/hardening

Networks

▪️ Tools

▪️ Labs

Awesome Lists

Hacking/Penetration Testing

▪️ Pentests bookmarks collection

▪️ Bounty programs

▪️ Web Training Apps (local installation)

▪️ Labs (ethical hacking platforms)

Your daily knowledge and news

▪️ RSS Readers

▪️ Security

Other Cheat Sheets

DNS Servers list (privacy)

Build your own DNS Servers

One-liners

Table of Contents

Tool: terminal

Reload shell without exit

Close shell keeping all subprocess running

Exit without saving shell history

Perform a branching conditional

Pipe stdout and stderr to separate commands

Redirect stdout and stderr each to separate files and print both to the screen

List of commands you use most often

Quickly backup a file

Empty a file (truncate to 0 size)

Delete all files in a folder that don’t match a certain file extension

Pass multi-line string to a file

Edit a file on a remote host using vim

Create a directory and change into it at the same time

Convert uppercase files to lowercase files

Print a row of characters across the terminal

Show shell history without line numbers

Run command(s) after exit session

Generate a sequence of numbers

Tool: mount