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  1. <p align="center">
  2. <img src="https://github.com/trimstray/awesome-ninja-admins/blob/master/doc/img/awesome_ninja_admins.png"
  3. alt="Master">
  4. </p>
  5. <br>
  6. <h4 align="center">A collection of awesome lists, manuals, blogs, hacks, one-liners and tools for <b>Awesome Ninja Admins</b>.</h4>
  7. <br>
  8. <p align="center">
  9. <a href="https://github.com/trimstray/awesome-ninja-admins/tree/master">
  10. <img src="https://img.shields.io/badge/Branch-master-green.svg?longCache=true"
  11. alt="Branch">
  12. </a>
  13. <a href="https://awesome.re">
  14. <img src="https://awesome.re/badge.svg"
  15. alt="Awesome">
  16. <a href="https://github.com/trimstray/awesome-ninja-admins">
  17. <img src="https://img.shields.io/badge/Status-10072018-red.svg?longCache=true"
  18. alt="Status">
  19. </a>
  20. <a href="http://www.gnu.org/licenses/">
  21. <img src="https://img.shields.io/badge/License-GNU-blue.svg?longCache=true"
  22. alt="License">
  23. </a>
  24. </p>
  25. <div align="center">
  26. <sub>Created by
  27. <a href="https://twitter.com/trimstray">trimstray</a> and
  28. <a href="https://github.com/trimstray/awesome-ninja-admins/graphs/contributors">
  29. contributors
  30. </a>
  31. </div>
  32. <br>
  33. ***
  34. ## Who is Ninja Admins?
  35. - race of pure evil who rule the network through a monarchistic feudelic system
  36. - they never opened the door for strangers (or anyone at all)
  37. - they know very nasty piece of code like a **[fork bombs](https://en.wikipedia.org/wiki/Fork_bomb)**
  38. - they can make dd is not a **[destroyer of disks](http://www.noah.org/wiki/Dd_-_Destroyer_of_Disks)**
  39. - they know that `#!/usr/bin/env bash` superior to `#!/bin/bash`
  40. - they know that `su -` logs in completely as root
  41. - they miss and cry for **[Slackware](http://www.slackware.com/)** on production
  42. - they love the old admin nix-world
  43. ## :ballot_box_with_check: Todo
  44. - [ ] Add useful shell functions
  45. - [ ] Add one-liners for collection tools (eg. CLI Tools)
  46. - [ ] Add Ninja Admins T-Shirt stickers
  47. - [ ] Generate Awesome Ninja Admins book (eg. pdf format)
  48. ## Ninja Admins Collection
  49. #### CLI Tools
  50. ##### :black_small_square: Shells
  51. <p>
  52. &nbsp;&nbsp;:small_orange_diamond: <a href="https://ohmyz.sh/"><b>Oh My ZSH!</b></a> - the best framework for managing your Zsh configuration.<br>
  53. &nbsp;&nbsp;:small_orange_diamond: <a href="https://github.com/Bash-it/bash-it"><b>bash-it</b></a> - a community Bash framework.<br>
  54. </p>
  55. ##### :black_small_square: Managers
  56. <p>
  57. &nbsp;&nbsp;:small_orange_diamond: <a href="https://midnight-commander.org/"><b>Midnight Commander</b></a> - visual file manager, licensed under GNU General Public License.<br>
  58. &nbsp;&nbsp;:small_orange_diamond: <a href="https://www.gnu.org/software/screen/"><b>screen</b></a> - full-screen window manager that multiplexes a physical terminal.<br>
  59. &nbsp;&nbsp;:small_orange_diamond: <a href="https://github.com/tmux/tmux/wiki"><b>tmux</b></a> - terminal multiplexer, lets you switch easily between several programs in one terminal.<br>
  60. </p>
  61. ##### :black_small_square: Network
  62. <p>
  63. &nbsp;&nbsp;:small_orange_diamond: <a href="https://curl.haxx.se/"><b>Curl</b></a> - command line tool and library
  64. for transferring data with URLs.<br>
  65. &nbsp;&nbsp;:small_orange_diamond: <a href="https://github.com/jkbrzt/httpie"><b>HTTPie</b></a> - a user-friendly HTTP client.<br>
  66. &nbsp;&nbsp;:small_orange_diamond: <a href="https://gnutls.org/manual/html_node/gnutls_002dcli-Invocation.html"><b>gnutls-cli</b></a> - client program to set up a TLS connection to some other computer.<br>
  67. &nbsp;&nbsp;:small_orange_diamond: <a href="http://netcat.sourceforge.net/"><b>netcat</b></a> - networking utility which reads and writes data across network connections, using the TCP/IP protocol.<br>
  68. &nbsp;&nbsp;:small_orange_diamond: <a href="https://www.tcpdump.org/"><b>tcpdump</b></a> - powerful command-line packet analyzer.<br>
  69. </p>
  70. ##### :black_small_square: Databases
  71. <p>
  72. &nbsp;&nbsp;:small_orange_diamond: <a href="https://github.com/dbcli/pgcli"><b>pgcli</b></a> - postgres CLI with autocompletion and syntax highlighting.<br>
  73. &nbsp;&nbsp;:small_orange_diamond: <a href="https://github.com/dbcli/mycli"><b>mycli</b></a> - terminal client for MySQL with autocompletion and syntax highlighting.<br>
  74. </p>
  75. #### Web Tools
  76. ##### :black_small_square: SSL
  77. <p>
  78. &nbsp;&nbsp;:small_orange_diamond: <a href="https://www.ssllabs.com/ssltest/"><b>SSL Server Test</b></a> - free online service performs a deep analysis of the configuration of any SSL web server.<br>
  79. &nbsp;&nbsp;:small_orange_diamond: <a href="https://dev.ssllabs.com/ssltest/"><b>SSL Server Test (DEV)</b></a> - free online service performs a deep analysis of the configuration of any SSL web server.<br>
  80. &nbsp;&nbsp;:small_orange_diamond: <a href="https://www.htbridge.com/ssl/"><b>ImmuniWeb® SSLScan</b></a> - test SSL/TLS (PCI DSS, HIPAA and NIST).<br>
  81. &nbsp;&nbsp;:small_orange_diamond: <a href="https://report-uri.com/home/tools"><b>Report URI</b></a> - monitoring security policies like CSP and HPKP.<br>
  82. &nbsp;&nbsp;:small_orange_diamond: <a href="https://csp-evaluator.withgoogle.com/"><b>CSP Evaluator</b></a> - allows developers and security experts to check if a Content Security Policy.<br>
  83. &nbsp;&nbsp;:small_orange_diamond: <a href="https://ccadb.org/resources"><b>Common CA Database</b></a> - repository of information about CAs, and their root and intermediate certificates.<br>
  84. &nbsp;&nbsp;:small_orange_diamond: <a href="https://certstream.calidog.io/"><b>CERTSTREAM</b></a> - real-time certificate transparency log update stream.<br>
  85. </p>
  86. ##### :black_small_square: HTTP Headers
  87. <p>
  88. &nbsp;&nbsp;:small_orange_diamond: <a href="https://securityheaders.com/"><b>Security Headers</b></a> - analyse the HTTP response headers (with rating system to the results).<br>
  89. &nbsp;&nbsp;:small_orange_diamond: <a href="https://observatory.mozilla.org/"><b>Observatory by Mozilla</b></a> - set of tools to analyze your website.<br>
  90. </p>
  91. ##### :black_small_square: DNS
  92. <p>
  93. &nbsp;&nbsp;:small_orange_diamond: <a href="http://viewdns.info/"><b>ViewDNS</b></a> - one source for free DNS related tools and information.<br>
  94. &nbsp;&nbsp;:small_orange_diamond: <a href="https://dnsspy.io/"><b>DNS Spy</b></a> - monitor, validate and verify your DNS configurations.<br>
  95. &nbsp;&nbsp;:small_orange_diamond: <a href="https://dnslytics.com/"><b>DNSlytics</b></a> - online investigation tool.<br>
  96. </p>
  97. ##### :black_small_square: Mail
  98. <p>
  99. &nbsp;&nbsp;:small_orange_diamond: <a href="https://mxtoolbox.com/SuperTool.aspx"><b>MX Toolbox</b></a> - all of your MX record, DNS, blacklist and SMTP diagnostics in one integrated tool.<br>
  100. </p>
  101. ##### :black_small_square: Mass scanners (search engines)
  102. <p>
  103. &nbsp;&nbsp;:small_orange_diamond: <a href="https://censys.io/"><b>Censys</b></a> - platform that helps information security practitioners discover, monitor, and analyze devices.<br>
  104. &nbsp;&nbsp;:small_orange_diamond: <a href="https://www.shodan.io/"><b>Shodan</b></a> - the world's first search engine for Internet-connected devices.<br>
  105. &nbsp;&nbsp;:small_orange_diamond: <a href="https://viz.greynoise.io/table"><b>GreyNoise</b></a> - mass scanner (such as Shodan and Censys).<br>
  106. </p>
  107. ##### :black_small_square: Net-tools
  108. <p>
  109. &nbsp;&nbsp;:small_orange_diamond: <a href="https://toolbar.netcraft.com/site_report"><b>Netcraft</b></a> - detailed report about the site, helping you to make informed choices about their integrity.<br>
  110. &nbsp;&nbsp;:small_orange_diamond: <a href="https://securitytrails.com/"><b>Security Trails</b></a> - APIs for Security Companies, Researchers and Teams.<br>
  111. &nbsp;&nbsp;:small_orange_diamond: <a href="https://tools.keycdn.com/curl"><b>Online Curl</b></a> - curl test, analyze HTTP Response Headers.<br>
  112. &nbsp;&nbsp;:small_orange_diamond: <a href="http://ping.eu/"><b>Ping.eu</b></a> - online Ping, Traceroute, DNS lookup, WHOIS and others.<br>
  113. &nbsp;&nbsp;:small_orange_diamond: <a href="https://network-tools.com/"><b>Network-Tools</b></a> - network tools for webmasters, IT technicians & geeks.<br>
  114. &nbsp;&nbsp;:small_orange_diamond: <a href="https://www.url-encode-decode.com/"><b>URL Encode/Decode</b></a> - tool from above to either encode or decode a string of text.<br>
  115. &nbsp;&nbsp;:small_orange_diamond: <a href="https://www.hardenize.com/"><b>Hardenize</b></a> - deploy the security standards.<br>
  116. </p>
  117. ##### :black_small_square: Performance
  118. <p>
  119. &nbsp;&nbsp;:small_orange_diamond: <a href="https://gtmetrix.com/"><b>GTmetrix</b></a> - analyze your site’s speed and make it faster.<br>
  120. &nbsp;&nbsp;:small_orange_diamond: <a href="https://performance.sucuri.net/"><b>Sucuri loadtimetester</b></a> - test here the
  121. performance of any of your sites from across the globe.<br>
  122. </p>
  123. ##### :black_small_square: Passwords
  124. <p>
  125. &nbsp;&nbsp;:small_orange_diamond: <a href="https://www.random.org/passwords/"><b>Random.org</b></a> - generate random passwords.<br>
  126. &nbsp;&nbsp;:small_orange_diamond: <a href="https://gotcha.pw/"><b>Gotcha?</b></a> - list of 1.4 billion accounts circulates around the Internet.<br>
  127. &nbsp;&nbsp;:small_orange_diamond: <a href="https://haveibeenpwned.com/"><b>have i been pwned?</b></a> - check if you have an account that has been compromised in a data breach.<br>
  128. </p>
  129. #### Manuals/Howtos/Tutorials
  130. ##### :black_small_square: Bash
  131. <p>
  132. &nbsp;&nbsp;:small_orange_diamond: <a href="https://github.com/dylanaraps/pure-bash-bible"><b>pure-bash-bible</b></a> - a collection of pure bash alternatives to external processes.<br>
  133. &nbsp;&nbsp;:small_orange_diamond: <a href="http://wiki.bash-hackers.org/start"><b>The Bash Hackers Wiki</b></a> - hold documentation of any kind about GNU Bash.<br>
  134. </p>
  135. ##### :black_small_square: Unix tutorials
  136. <p>
  137. &nbsp;&nbsp;:small_orange_diamond: <a href="https://www.cyberciti.biz/"><b>nixCraft</b></a> - linux and unix tutorials for new and seasoned sysadmin.<br>
  138. &nbsp;&nbsp;:small_orange_diamond: <a href="https://www.tecmint.com/"><b>TecMint</b></a> - the ideal Linux blog for Sysadmins & Geeks.<br>
  139. </p>
  140. ##### :black_small_square: Hacking
  141. <p>
  142. &nbsp;&nbsp;:small_orange_diamond: <a href="http://www.hackingarticles.in/"><b>Hacking Articles</b></a> - LRaj Chandel's Security & Hacking Blog.<br>
  143. </p>
  144. #### Blogs
  145. <p>
  146. &nbsp;&nbsp;:small_orange_diamond: <a href="http://www.brendangregg.com/"><b>Brendan Gregg's Blog</b></a> - Brendan Gregg is an industry expert in computing performance and cloud computing.<br>
  147. &nbsp;&nbsp;:small_orange_diamond: <a href="http://gynvael.coldwind.pl/"><b>Gynvael "GynDream" Coldwind</b></a> - Gynvael is a IT security engineer at Google.<br>
  148. &nbsp;&nbsp;:small_orange_diamond: <a href="http://lcamtuf.coredump.cx/"><b>Michał "lcamtuf" Zalewski</b></a> - "white hat" hacker, computer security expert.<br>
  149. &nbsp;&nbsp;:small_orange_diamond: <a href="https://ma.ttias.be/"><b>Mattias Geniar</b></a> - developer, Sysadmin, Blogger, Podcaster and Public Speaker.<br>
  150. &nbsp;&nbsp;:small_orange_diamond: <a href="https://nickcraver.com/"><b>Nick Craver</b></a> - Software Developer and Systems Administrator for Stack Exchange.<br>
  151. &nbsp;&nbsp;:small_orange_diamond: <a href="https://robert.penz.name/"><b>Robert Penz</b></a> - IT security Expert.<br>
  152. &nbsp;&nbsp;:small_orange_diamond: <a href="https://scotthelme.co.uk/"><b>Scott Helme</b></a> - Security Researcher, international speaker and founder of securityheaders.com and report-uri.com.<br>
  153. &nbsp;&nbsp;:small_orange_diamond: <a href="https://security.szurek.pl/"><b>Kacper Szurek</b></a> - Detection Engineer at ESET.<br>
  154. &nbsp;&nbsp;:small_orange_diamond: <a href="https://www.troyhunt.com/"><b>Troy Hunt</b></a> - Microsoft Regional Director and Microsoft Most Valuable Professional for Developer Security.<br>
  155. &nbsp;&nbsp;:small_orange_diamond: <a href="https://linux-audit.com/"><b>Linux Audit</b></a> - the Linux security blog about Auditing, Hardening, and Compliance by Michael Boelen.<br>
  156. &nbsp;&nbsp;:small_orange_diamond: <a href="http://www.grymoire.com/"><b>The Grymoire</b></a> - collection of useful incantations for wizards, be you computer wizards, magicians, or whatever.<br>
  157. </p>
  158. #### Systems/Services
  159. ##### :black_small_square: Systems
  160. <p>
  161. &nbsp;&nbsp;:small_orange_diamond: <a href="http://www.slackware.com/"><b>Slackware</b></a> - the most "Unix-like" Linux distribution.<br>
  162. &nbsp;&nbsp;:small_orange_diamond: <a href="https://www.openbsd.org/"><b>OpenBSD</b></a> - multi-platform 4.4BSD-based UNIX-like operating system.<br>
  163. &nbsp;&nbsp;:small_orange_diamond: <a href="https://hardenedbsd.org/"><b>HardenedBSD</b></a> - HardenedBSD aims to implement innovative exploit mitigation and security solutions.<br>
  164. </p>
  165. ##### :black_small_square: HTTP(s) Services
  166. <p>
  167. &nbsp;&nbsp;:small_orange_diamond: <a href="https://varnish-cache.org/"><b>Varnish HTTP Cache</b></a> - HTTP accelerator designed for content-heavy dynamic web sites.<br>
  168. </p>
  169. ##### :black_small_square: Security/hardening
  170. <p>
  171. &nbsp;&nbsp;:small_orange_diamond: <a href="https://emeraldonion.org/"><b>Emerald Onion</b></a> - seattle-based encrypted-transit internet service provider.<br>
  172. &nbsp;&nbsp;:small_orange_diamond: <a href="https://www.unbound.net/"><b>Unbound</b></a> - validating, recursive, and caching DNS resolver (with TLS).<br>
  173. </p>
  174. #### Lists
  175. <p>
  176. &nbsp;&nbsp;:small_orange_diamond: <a href="https://github.com/kahun/awesome-sysadmin"><b>Awesome Sysadmin</b></a> - amazingly awesome open source sysadmin resources.<br>
  177. &nbsp;&nbsp;:small_orange_diamond: <a href="https://github.com/alebcay/awesome-shell"><b>Awesome Shell</b></a> - awesome command-line frameworks, toolkits, guides and gizmos.<br>
  178. &nbsp;&nbsp;:small_orange_diamond: <a href="https://github.com/Hack-with-Github/Awesome-Hacking"><b>Awesome-Hacking</b></a> - awesome lists for hackers, pentesters and security researchers.<br>
  179. &nbsp;&nbsp;:small_orange_diamond: <a href="https://github.com/learnbyexample/Command-line-text-processing"><b>Command-line-text-processing</b></a> - from finding text to search and replace, from sorting to beautifying text and more.<br>
  180. </p>
  181. #### Hacking/Penetration testing
  182. ##### :black_small_square: Bounty programs
  183. <p>
  184. &nbsp;&nbsp;:small_orange_diamond: <a href="https://www.openbugbounty.org/"><b>Openbugbounty</b></a> - allows any security researcher reporting a vulnerability on any website.<br>
  185. &nbsp;&nbsp;:small_orange_diamond: <a href="https://www.hackerone.com/"><b>hackerone</b></a> - global hacker community to surface the most relevant security issues.<br>
  186. &nbsp;&nbsp;:small_orange_diamond: <a href="https://www.bugcrowd.com/"><b>bugcrowd</b></a> - crowdsourced cybersecurity for the enterprise.<br>
  187. &nbsp;&nbsp;:small_orange_diamond: <a href="https://crowdshield.com/"><b>Crowdshield</b></a> - crowdsourced Security & Bug Bounty Management.<br>
  188. </p>
  189. ##### :black_small_square: Web Training Apps
  190. <p>
  191. &nbsp;&nbsp;:small_orange_diamond: <a href="https://metasploit.help.rapid7.com/docs/metasploitable-2"><b>Metasploitable 2</b></a> - vulnerable web application amongst security researchers.<br>
  192. &nbsp;&nbsp;:small_orange_diamond: <a href="http://www.dvwa.co.uk/"><b>DVWA</b></a> - PHP/MySQL web application that is damn vulnerable.<br>
  193. &nbsp;&nbsp;:small_orange_diamond: <a href="https://sourceforge.net/projects/mutillidae/"><b>OWASP Mutillidae II</b></a> - free, open source, deliberately vulnerable web-application.<br>
  194. &nbsp;&nbsp;:small_orange_diamond: <a href="https://www.owasp.org/index.php/OWASP_Juice_Shop_Project"><b>OWASP Juice Shop Project</b></a> - the most bug-free vulnerable application in existence.<br>
  195. &nbsp;&nbsp;:small_orange_diamond: <a href="https://www.owasp.org/index.php/Category:OWASP_WebGoat_Project"><b>OWASP WebGoat Project</b></a> - insecure web application maintained by OWASP designed to teach web app security.<br>
  196. &nbsp;&nbsp;:small_orange_diamond: <a href="https://github.com/opendns/Security_Ninjas_AppSec_Training"><b>Security Ninjas</b></a> - open source application security training program.<br>
  197. </p>
  198. #### One-liners
  199. ##### Table of Contents
  200. - **[System](#system)**
  201. * [terminal](#tool-terminal)
  202. * [mount](#tool-mount)
  203. * [fuser](#tool-fuser)
  204. * [ps](#tool-ps)
  205. * [top](#tool-top)
  206. * [find](#tool-find)
  207. * [diff](#tool-diff)
  208. * [tail](#tool-tail)
  209. * [cpulimit](#tool-cpulimit)
  210. * [pwdx](#tool-pwdx)
  211. * [tr](#tool-tr)
  212. * [chmod](#tool-chmod)
  213. * [who](#tool-who)
  214. * [screen](#tool-screen)
  215. * [du](#tool-du)
  216. * [inotifywait](#tool-inotifywait)
  217. * [openssl](#tool-openssl)
  218. * [gnutls](#tool-gnutls)
  219. * [secure-delete](#tool-secure-delete)
  220. - **[HTTP/HTTPS](#http-https)**
  221. * [curl](#tool-curl)
  222. * [httpie](#tool-httpie)
  223. - **[Network](#network)**
  224. * [ssh](#tool-ssh)
  225. * [linux-dev](#tool-linux-dev)
  226. * [tcpdump](#tool-tcpdump)
  227. * [tcpick](#tool-tcpick)
  228. * [ngrep](#tool-ngrep)
  229. * [hping3](#tool-hping3)
  230. * [netcat](#tool-netcat)
  231. * [socat](#tool-socat)
  232. * [lsof](#tool-lsof)
  233. * [netstat](#tool-netstat)
  234. * [rsync](#tool-rsync)
  235. * [host](#tool-host)
  236. * [dig](#tool-dig)
  237. * [dns-other](#tool-dns-other)
  238. - **[Programming](#programming)**
  239. * [awk](#tool-awk)
  240. * [sed](#tool-sed)
  241. * [grep](#tool-grep)
  242. <a name="system"><b>System</b></a>
  243. ##### Tool: [terminal](https://en.wikipedia.org/wiki/Linux_console)
  244. ###### Close shell keeping all subprocess running
  245. ```bash
  246. disown -a && exit
  247. ```
  248. ###### Exit without saving shell history
  249. ```bash
  250. kill -9 $$
  251. unset HISTFILE && exit
  252. ```
  253. ###### Perform a branching conditional
  254. ```bash
  255. true && { echo success;} || { echo failed; }
  256. ```
  257. ###### Pipe stdout and stderr to separate commands
  258. ```bash
  259. some_command > >(/bin/cmd_for_stdout) 2> >(/bin/cmd_for_stderr)
  260. ```
  261. ###### Pipe stdout and stderr to separate commands
  262. ```bash
  263. (some_command 2>&1 1>&3 | tee errorlog ) 3>&1 1>&2 | tee stdoutlog
  264. ```
  265. ###### List of commands you use most often
  266. ```bash
  267. history | awk '{ a[$2]++ } END { for(i in a) { print a[i] " " i } }' | sort -rn | head
  268. ```
  269. ###### Quickly backup a file
  270. ```bash
  271. cp filename{,.orig}
  272. ```
  273. ###### Delete all files in a folder that don't match a certain file extension
  274. ```bash
  275. rm !(*.foo|*.bar|*.baz)
  276. ```
  277. ###### Edit a file on a remote host using vim
  278. ```bash
  279. vim scp://user@host//etc/fstab
  280. ```
  281. ###### Create a directory and change into it at the same time
  282. ```bash
  283. mkd () { mkdir -p "$@" && cd "$@"; }
  284. ```
  285. ###### Convert uppercase files to lowercase files
  286. ```bash
  287. rename 'y/A-Z/a-z/' *
  288. ```
  289. ###### Print a row of characters across the terminal
  290. ```bash
  291. printf "%`tput cols`s" | tr ' ' '#'
  292. ```
  293. ###### Show shell history without line numbers
  294. ```bash
  295. history | cut -c 8-
  296. fc -l -n 1 | sed 's/^\s*//'
  297. ```
  298. ###### Run command(s) after exit session
  299. ```bash
  300. cat > /etc/profile << __EOF__
  301. _after_logout() {
  302. username=$(whoami)
  303. for _pid in $(ps afx | grep sshd | grep "$username" | awk '{print $1}') ; do
  304. kill -9 $_pid
  305. done
  306. }
  307. trap _after_logout EXIT
  308. __EOF__
  309. ```
  310. ___
  311. ##### Tool: [mount](https://en.wikipedia.org/wiki/Mount_(Unix))
  312. ###### Mount a temporary ram partition
  313. ```bash
  314. mount -t tmpfs tmpfs /mnt -o size=64M
  315. ```
  316. * `-t` - filesystem type
  317. * `-o` - mount options
  318. ___
  319. ##### Tool: [fuser](https://en.wikipedia.org/wiki/Fuser_(Unix))
  320. ###### Kills a process that is locking a file
  321. ```bash
  322. fuser -k filename
  323. ```
  324. ###### Show what PID is listening on specific port
  325. ```bash
  326. fuser -v 53/udp
  327. ```
  328. ___
  329. ##### Tool: [ps](https://en.wikipedia.org/wiki/Ps_(Unix))
  330. ###### Show a 4-way scrollable process tree with full details
  331. ```bash
  332. ps awwfux | less -S
  333. ```
  334. ###### Processes per user counter
  335. ```bash
  336. ps hax -o user | sort | uniq -c | sort -r
  337. ```
  338. ___
  339. ##### Tool: [find](https://en.wikipedia.org/wiki/Find_(Unix))
  340. ###### Find files that have been modified on your system in the past 60 minutes
  341. ```bash
  342. find / -mmin 60 -type f
  343. ```
  344. ###### Find all files larger than 20M
  345. ```bash
  346. find / -type f -size +20M
  347. ```
  348. ###### Find duplicate files (based on MD5 hash)
  349. ```bash
  350. find -type f -exec md5sum '{}' ';' | sort | uniq --all-repeated=separate -w 33
  351. ```
  352. ###### Change permission only for files
  353. ```bash
  354. cd /var/www/site && find . -type f -exec chmod 766 {} \;
  355. cd /var/www/site && find . -type f -exec chmod 664 {} +
  356. ```
  357. ###### Change permission only for directories
  358. ```bash
  359. cd /var/www/site && find . -type d -exec chmod g+x {} \;
  360. cd /var/www/site && find . -type d -exec chmod g+rwx {} +
  361. ```
  362. ###### Find files and directories for specific user
  363. ```bash
  364. find . -user <username> -print
  365. ```
  366. ###### Find files and directories for all without specific user
  367. ```bash
  368. find . \!-user <username> -print
  369. ```
  370. ###### Delete older files than 60 days
  371. ```bash
  372. find . -type f -mtime +60 -delete
  373. ```
  374. ___
  375. ##### Tool: [top](https://en.wikipedia.org/wiki/Top_(software))
  376. ###### Use top to monitor only all processes with the specific string
  377. ```bash
  378. top -p $(pgrep -d , <str>)
  379. ```
  380. * `<str>` - process containing str (eg. nginx, worker)
  381. ___
  382. ##### Tool: [diff](https://en.wikipedia.org/wiki/Diff)
  383. ###### Compare two directory trees
  384. ```bash
  385. diff <(cd directory1 && find | sort) <(cd directory2 && find | sort)
  386. ```
  387. ___
  388. ##### Tool: [tail](https://en.wikipedia.org/wiki/Tail_(Unix))
  389. ###### Annotate tail -f with timestamps
  390. ```bash
  391. tail -f file | while read ; do echo "$(date +%T.%N) $REPLY" ; done
  392. ```
  393. ###### Analyse an Apache access log for the most common IP addresses
  394. ```bash
  395. tail -10000 access_log | awk '{print $1}' | sort | uniq -c | sort -n | tail
  396. ```
  397. ___
  398. ##### Tool: [tar](https://en.wikipedia.org/wiki/Tar_(computing))
  399. ###### System backup with exclude specific directories
  400. ```bash
  401. cd /
  402. tar -czvpf /mnt/system$(date +%d%m%Y%s).tgz --directory=/ \
  403. --exclude=proc/* --exclude=sys/* --exclude=dev/* --exclude=mnt/* .
  404. ```
  405. ###### System backup with exclude specific directories (pigz)
  406. ```bash
  407. cd /
  408. tar cvpf /backup/snapshot-$(date +%d%m%Y%s).tgz --directory=/ \
  409. --exclude=proc/* --exclude=sys/* --exclude=dev/* \
  410. --exclude=mnt/* --exclude=tmp/* --use-compress-program=pigz .
  411. ```
  412. ___
  413. ##### Tool: [dump](https://en.wikipedia.org/wiki/Dump_(program))
  414. ###### System backup to file
  415. ```bash
  416. dump -y -u -f /backup/system$(date +%d%m%Y%s).lzo /
  417. ```
  418. ###### Restore system from lzo file
  419. ```bash
  420. cd /
  421. restore -rf /backup/system$(date +%d%m%Y%s).lzo
  422. ```
  423. ___
  424. ##### Tool: [cpulimit](http://cpulimit.sourceforge.net/)
  425. ###### Limit the cpu usage of a process
  426. ```bash
  427. cpulimit -p pid -l 50
  428. ```
  429. ___
  430. ##### Tool: [pwdx](https://www.cyberciti.biz/faq/unix-linux-pwdx-command-examples-usage-syntax/)
  431. ###### Show current working directory of a process
  432. ```bash
  433. pwdx <pid>
  434. ```
  435. ___
  436. ##### Tool: [taskset](https://www.cyberciti.biz/faq/taskset-cpu-affinity-command/)
  437. ###### Start a command on only one CPU core
  438. ```bash
  439. taskset -c 0 <command>
  440. ```
  441. ___
  442. ##### Tool: [tr](https://en.wikipedia.org/wiki/Tr_(Unix))
  443. ###### Show directories in the PATH, one per line
  444. ```bash
  445. tr : '\n' <<<$PATH
  446. ```
  447. ___
  448. ##### Tool: [chmod](https://en.wikipedia.org/wiki/Chmod)
  449. ###### Remove executable bit from all files in the current directory
  450. ```bash
  451. chmod -R -x+X *
  452. ```
  453. ###### Restore permission for /bin/chmod
  454. ```bash
  455. # 1:
  456. cp /bin/ls chmod.01
  457. cp /bin/chmod chmod.01
  458. ./chmod.01 700 file
  459. # 2:
  460. /bin/busybox chmod 0700 /bin/chmod
  461. # 3:
  462. setfacl --set u::rwx,g::---,o::--- /bin/chmod
  463. ```
  464. ___
  465. ##### Tool: [who](https://en.wikipedia.org/wiki/Who_(Unix))
  466. ###### Find last reboot time
  467. ```bash
  468. who -b
  469. ```
  470. ___
  471. ##### Tool: [screen](https://en.wikipedia.org/wiki/GNU_Screen)
  472. ###### Start screen in detached mode
  473. ```bash
  474. screen -d -m [<command>]
  475. ```
  476. ___
  477. ##### Tool: [du](https://en.wikipedia.org/wiki/GNU_Screen)
  478. ###### Show 20 biggest directories with 'K M G'
  479. ```bash
  480. du | sort -r -n | awk '{split("K M G",v); s=1; while($1>1024){$1/=1024; s++} print int($1)" "v[s]"\t"$2}' | head -n 20
  481. ```
  482. ___
  483. ##### Tool: [inotifywait](https://en.wikipedia.org/wiki/GNU_Screen)
  484. ###### Init tool everytime a file in a directory is modified
  485. ```bash
  486. while true ; do inotifywait -r -e MODIFY dir/ && ls dir/ ; done;
  487. ```
  488. ___
  489. ##### Tool: [openssl](https://www.openssl.org/)
  490. ###### Testing connection to remote host
  491. ```bash
  492. echo | openssl s_client -connect google.com:443 -showcerts
  493. ```
  494. ###### Testing connection to remote host with specific ssl version
  495. ```bash
  496. openssl s_client -tls1_2 -connect google.com:443
  497. ```
  498. ###### Testing connection to remote host with specific ssl cipher
  499. ```bash
  500. openssl s_client -cipher 'AES128-SHA' -connect google.com:443
  501. ```
  502. ###### Generate private key
  503. ```bash
  504. # _ciph: des3, aes
  505. ( _ciph="des3" ; _fd="private.key" ; _len="2048" ; \
  506. openssl genrsa -${_ciph} -out ${_fd} ${_len} )
  507. ```
  508. ###### Remove password from private key
  509. ```bash
  510. ( _fd="private.key" ; _fd_unp="private_unp.key" ; \
  511. openssl rsa -in ${_fd} -out ${_fd_unp} )
  512. ```
  513. ###### Get public key from private key
  514. ```bash
  515. ( _fd="private.key" ; _fd_pub="public.key" ; \
  516. openssl rsa -pubout -in ${_fd} -out ${_fd_pub} )
  517. ```
  518. ###### Generate private key + csr
  519. ```bash
  520. ( _fd="private.key" ; _fd_csr="request.csr" ; _len="2048" ; \
  521. openssl req -out ${_fd_csr} -new -newkey rsa:${_len} -nodes -keyout ${_fd} )
  522. ```
  523. ###### Generate csr
  524. ```bash
  525. ( _fd="private.key" ; _fd_csr="request.csr" ; \
  526. openssl req -out ${_fd_csr} -new -key ${_fd} )
  527. ```
  528. ###### Generate csr (metadata from exist certificate)
  529. ```bash
  530. ( _fd="private.key" ; _fd_csr="request.csr" ; _fd_crt="cert.crt" ; \
  531. openssl x509 -x509toreq -in ${_fd_crt} -out ${_fd_csr} -signkey ${_fd} )
  532. ```
  533. ###### Generate csr with -config param
  534. ```bash
  535. ( _fd="private.key" ; _fd_csr="request.csr" ; \
  536. openssl req -new -sha256 -key ${_fd} -out ${_fd_csr} \
  537. -config <(
  538. cat <<-EOF
  539. [req]
  540. default_bits = 2048
  541. prompt = no
  542. default_md = sha256
  543. req_extensions = req_ext
  544. distinguished_name = dn
  545. [ dn ]
  546. C=<two-letter ISO abbreviation for your country>
  547. ST=<state or province where your organization is legally located>
  548. L=<city where your organization is legally located>
  549. O=<legal name of your organization>
  550. OU=<section of the organization>
  551. CN=<fully qualified domain name>
  552. [ req_ext ]
  553. subjectAltName = @alt_names
  554. [ alt_names ]
  555. DNS.1 = <fully qualified domain name>
  556. DNS.2 = <next domain>
  557. DNS.3 = <next domain>
  558. EOF
  559. ))
  560. ```
  561. ###### Convert DER to PEM
  562. ```bash
  563. ( _fd_der="cert.crt" ; _fd_pem="cert.pem" ; \
  564. openssl x509 -in ${_fd_der} -inform der -outform pem -out ${_fd_pem} )
  565. ```
  566. ###### Convert PEM to DER
  567. ```bash
  568. ( _fd_der="cert.crt" ; _fd_pem="cert.pem" ; \
  569. openssl x509 -in ${_fd_pem} -outform der -out ${_fd_der} )
  570. ```
  571. ###### Checking whether the private key and the certificate match
  572. ```bash
  573. (openssl rsa -noout -modulus -in private.key | openssl md5 ; openssl x509 -noout -modulus -in certificate.crt | openssl md5) | uniq
  574. ```
  575. ___
  576. ##### Tool: [gnutls-cli](https://gnutls.org/manual/html_node/gnutls_002dcli-Invocation.html)
  577. ###### Testing connection to remote host (with sni)
  578. ```bash
  579. gnutls-cli -p 443 google.com
  580. ```
  581. ###### Testing connection to remote host (without sni)
  582. ```bash
  583. gnutls-cli --disable-sni -p 443 google.com
  584. ```
  585. ___
  586. ##### Tool: [secure-delete](https://wiki.archlinux.org/index.php/Securely_wipe_disk)
  587. ###### Secure delete with shred
  588. ```bash
  589. shred -vfuz -n 10 file
  590. shred --verbose --random-source=/dev/urandom -n 1 /dev/sda
  591. ```
  592. ###### Secure delete with scrub
  593. ```bash
  594. scrub -p dod /dev/sda
  595. scrub -p dod -r file
  596. ```
  597. ###### Secure delete with badblocks
  598. ```bash
  599. badblocks -s -w -t random -v /dev/sda
  600. badblocks -c 10240 -s -w -t random -v /dev/sda
  601. ```
  602. ###### Secure delete with secure-delete
  603. ```bash
  604. srm -vz /tmp/file
  605. sfill -vz /local
  606. sdmem -v
  607. swapoff /dev/sda5 && sswap -vz /dev/sda5
  608. ```
  609. <a name="http-https"><b>HTTP/HTTPS</b></a>
  610. ##### Tool: [curl](https://curl.haxx.se)
  611. ```bash
  612. curl -Iks https://www.google.com
  613. ```
  614. * `-I` - show response headers only
  615. * `-k` - insecure connection when using ssl
  616. * `-s` - silent mode (not display body)
  617. ```bash
  618. curl -Iks --location -X GET -A "x-agent" https://www.google.com
  619. ```
  620. * `--location` - follow redirects
  621. * `-X` - set method
  622. * `-A` - set user-agent
  623. ```bash
  624. curl -Iks --location -X GET -A "x-agent" --proxy http://127.0.0.1:16379 https://www.google.com
  625. ```
  626. * `--proxy [socks5://|http://]` - set proxy server
  627. ___
  628. ##### Tool: [httpie](https://httpie.org/)
  629. ```bash
  630. http -p Hh https://www.google.com
  631. ```
  632. * `-p` - print request and response headers
  633. * `H` - request headers
  634. * `B` - request body
  635. * `h` - response headers
  636. * `b` - response body
  637. ```bash
  638. http -p Hh --follow --max-redirects 5 --verify no https://www.google.com
  639. ```
  640. * `-F, --follow` - follow redirects
  641. * `--max-redirects N` - maximum for `--follow`
  642. * `--verify no` - skip SSL verification
  643. ```bash
  644. http -p Hh --follow --max-redirects 5 --verify no --proxy http:http://127.0.0.1:16379 https://www.google.com
  645. ```
  646. * `--proxy [http:]` - set proxy server
  647. <a name="network"><b>Network</b></a>
  648. ##### Tool: [ssh](https://www.openssh.com/)
  649. ###### Compare a remote file with a local file
  650. ```bash
  651. ssh user@host cat /path/to/remotefile | diff /path/to/localfile -
  652. ```
  653. ###### SSH connection through host in the middle
  654. ```bash
  655. ssh -t reachable_host ssh unreachable_host
  656. ```
  657. ###### Run command over ssh on remote host
  658. ```bash
  659. cat > cmd.txt << __EOF__
  660. cat /etc/hosts
  661. __EOF__
  662. ssh host -l user $(<cmd.txt)
  663. ```
  664. ###### Get public key from private key
  665. ```bash
  666. ssh-keygen -y -f ~/.ssh/id_rsa
  667. ```
  668. ###### Get all fingerprints
  669. ```bash
  670. ssh-keygen -l -f .ssh/known_hosts
  671. ```
  672. ###### Ssh authentication with user password
  673. ```bash
  674. ssh -o PreferredAuthentications=password -o PubkeyAuthentication=no user@remote_host
  675. ```
  676. ###### Ssh authentication with publickey
  677. ```bash
  678. ssh -o PreferredAuthentications=publickey -o PubkeyAuthentication=yes -i id_rsa user@remote_host
  679. ```
  680. ___
  681. ##### Tool: [linux-dev](https://www.tldp.org/LDP/abs/html/devref1.html)
  682. ###### Testing remote connection to port
  683. ```bash
  684. timeout 1 bash -c "</dev/<proto>/<host>/<port>" >/dev/null 2>&1 ; echo $?
  685. ```
  686. * `<proto` - set protocol (tcp/udp)
  687. * `<host>` - set remote host
  688. * `<port>` - set destination port
  689. ###### Read and write to TCP or UDP sockets with common bash tools
  690. ```bash
  691. exec 5<>/dev/tcp/<host>/<port>; cat <&5 & cat >&5; exec 5>&-
  692. ```
  693. ___
  694. ##### Tool: [tcpdump](http://www.tcpdump.org/)
  695. ```bash
  696. tcpdump -ne -i eth0 -Q in host 192.168.252.1 and port 443
  697. ```
  698. * `-n` - don't convert addresses
  699. * `-e` - print the link-level headers
  700. * `-i [iface]` - set interface
  701. * `-Q|-D [in|out|inout]` - choose send/receive direction (`-D` - for old tcpdump versions)
  702. * `host [ip|hostname]` - set host, also `[host not]`
  703. * `[and|or]` - set logic
  704. * `port [1-65535]` - set port number, also `[port not]`
  705. ```bash
  706. tcpdump -ne -i eth0 -Q in host 192.168.252.1 and port 443 -c 5 -w tcpdump.pcap
  707. ```
  708. * `-c [num]` - capture only num number of packets
  709. * `-w [filename]` - write packets to file, `-r [filename]` - reading from file
  710. ___
  711. ##### Tool: [tcpick](http://tcpick.sourceforge.net/)
  712. ###### Analyse packets in real-time
  713. ```bash
  714. while true ; do tcpick -a -C -r dump.pcap ; sleep 2 ; clear ; done
  715. ```
  716. ___
  717. ##### Tool: [ngrep](http://ngrep.sourceforge.net/usage.html)
  718. ```bash
  719. ngrep -d eth0 "www.google.com" port 443
  720. ```
  721. * `-d [iface|any]` - set interface
  722. * `[domain]` - set hostname
  723. * `port [1-65535]` - set port number
  724. ```bash
  725. ngrep -d eth0 "www.google.com" (host 10.240.20.2) and (port 443)
  726. ```
  727. * `(host [ip|hostname])` - filter by ip or hostname
  728. * `(port [1-65535])` - filter by port number
  729. ```bash
  730. ngrep -d eth0 -qt -O ngrep.pcap "www.google.com" port 443
  731. ```
  732. * `-q` - quiet mode (only payloads)
  733. * `-t` - added timestamps
  734. * `-O [filename]` - save output to file, `-I [filename]` - reading from file
  735. ```bash
  736. ngrep -d eth0 -qt 'HTTP' 'tcp'
  737. ```
  738. * `HTTP` - show http headers
  739. * `tcp|udp` - set protocol
  740. * `[src|dst] host [ip|hostname]` - set direction for specific node
  741. ```bash
  742. ngrep -l -q -d eth0 -i "User-Agent: curl*"
  743. ```
  744. * `-l` - stdout line buffered
  745. * `-i` - case-insensitive search
  746. ___
  747. ##### Tool: [hping3](http://www.hping.org/)
  748. ```bash
  749. hping3 -V -p 80 -s 5050 <scan_type> www.google.com
  750. ```
  751. * `-V|--verbose` - verbose mode
  752. * `-p|--destport` - set destination port
  753. * `-s|--baseport` - set source port
  754. * `<scan_type>` - set scan type
  755. * `-F|--fin` - set FIN flag, port open if no reply
  756. * `-S|--syn` - set SYN flag
  757. * `-P|--push` - set PUSH flag
  758. * `-A|--ack` - set ACK flag (use when ping is blocked, RST response back if the port is open)
  759. * `-U|--urg` - set URG flag
  760. * `-Y|--ymas` - set Y unused flag (0x80 - nullscan), port open if no reply
  761. * `-M 0 -UPF` - set TCP sequence number and scan type (URG+PUSH+FIN), port open if no reply
  762. ```bash
  763. hping3 -V -c 1 -1 -C 8 www.google.com
  764. ```
  765. * `-c [num]` - packet count
  766. * `-1` - set ICMP mode
  767. * `-C|--icmptype [icmp-num]` - set icmp type (default icmp-echo = 8)
  768. ```bash
  769. hping3 -V -c 1000000 -d 120 -S -w 64 -p 80 --flood --rand-source <remote_host>
  770. ```
  771. * `--flood` - sent packets as fast as possible (don't show replies)
  772. * `--rand-source` - random source address mode
  773. * `-d --data` - data size
  774. * `-w|--win` - winsize (default 64)
  775. ___
  776. ##### Tool: [netcat](http://netcat.sourceforge.net/)
  777. ```bash
  778. nc -kl 5000
  779. ```
  780. * `-l` - listen for an incoming connection
  781. * `-k` - listening after client has disconnected
  782. * `>filename.out` - save receive data to file (optional)
  783. ```bash
  784. nc 192.168.0.1 5051 < filename.in
  785. ```
  786. * `< filename.in` - send data to remote host
  787. ```bash
  788. nc -vz 10.240.30.3 5000
  789. ```
  790. * `-v` - verbose output
  791. * `-z` - scan for listening daemons
  792. ```bash
  793. nc -vzu 10.240.30.3 1-65535
  794. ```
  795. * `-u` - scan only udp ports
  796. ###### Transfer data file (archive)
  797. ```bash
  798. server> nc -l 5000 | tar xzvfp -
  799. client> tar czvfp - /path/to/dir | nc 10.240.30.3 5000
  800. ```
  801. ###### Launch remote shell
  802. ```bash
  803. server> nc -l 5000 -e /bin/bash
  804. client> nc 10.240.30.3 5000
  805. ```
  806. ###### Simple file server
  807. ```bash
  808. while true ; do nc -l 5000 | tar -xvf - ; done
  809. ```
  810. ###### Simple HTTP Server
  811. > Restarts web server after each request - remove `while` condition for only single connection.
  812. ```bash
  813. cat > index.html << __EOF__
  814. <!doctype html>
  815. <head>
  816. <meta charset="utf-8">
  817. <meta http-equiv="X-UA-Compatible" content="IE=edge,chrome=1">
  818. <title></title>
  819. <meta name="description" content="">
  820. <meta name="viewport" content="width=device-width, initial-scale=1">
  821. </head>
  822. <body>
  823. <p>
  824. Hello! It's a site.
  825. </p>
  826. </body>
  827. </html>
  828. __EOF__
  829. ```
  830. ```bash
  831. server> while : ; do \
  832. (echo -ne "HTTP/1.1 200 OK\r\nContent-Length: $(wc -c <index.html)\r\n\r\n" ; cat index.html;) \
  833. | nc -l -p 5000 \
  834. ; done
  835. ```
  836. * `-p` - port number
  837. ###### Simple HTTP Proxy (single connection)
  838. ```bash
  839. #!/usr/bin/env bash
  840. if [[ $# != 2 ]] ; then
  841. printf "%s\\n" \
  842. "usage: ./nc-proxy listen-port bk_host:bk_port"
  843. fi
  844. _listen_port="$1"
  845. _bk_host=$(echo "$2" | cut -d ":" -f1)
  846. _bk_port=$(echo "$2" | cut -d ":" -f2)
  847. printf " lport: %s\\nbk_host: %s\\nbk_port: %s\\n\\n" \
  848. "$_listen_port" "$_bk_host" "$_bk_port"
  849. _tmp=$(mktemp -d)
  850. _back="$_tmp/pipe.back"
  851. _sent="$_tmp/pipe.sent"
  852. _recv="$_tmp/pipe.recv"
  853. trap 'rm -rf "$_tmp"' EXIT
  854. mkfifo -m 0600 "$_back" "$_sent" "$_recv"
  855. sed "s/^/=> /" <"$_sent" &
  856. sed "s/^/<= /" <"$_recv" &
  857. nc -l -p "$_listen_port" <"$_back" \
  858. | tee "$_sent" \
  859. | nc "$_bk_host" "$_bk_port" \
  860. | tee "$_recv" >"$_back"
  861. ```
  862. ```bash
  863. server> chmod +x nc-proxy && ./nc-proxy 8080 192.168.252.10:8000
  864. lport: 8080
  865. bk_host: 192.168.252.10
  866. bk_port: 8000
  867. client> http -p h 10.240.30.3:8080
  868. HTTP/1.1 200 OK
  869. Accept-Ranges: bytes
  870. Cache-Control: max-age=31536000
  871. Content-Length: 2748
  872. Content-Type: text/html; charset=utf-8
  873. Date: Sun, 01 Jul 2018 20:12:08 GMT
  874. Last-Modified: Sun, 01 Apr 2018 21:53:37 GMT
  875. ```
  876. ###### Create a single-use TCP or UDP proxy
  877. ```bash
  878. ### TCP -> TCP
  879. nc -l -p 2000 -c "nc [ip|hostname] 3000"
  880. ### TCP -> UDP
  881. nc -l -p 2000 -c "nc -u [ip|hostname] 3000"
  882. ### UDP -> UDP
  883. nc -l -u -p 2000 -c "nc -u [ip|hostname] 3000"
  884. ### UDP -> TCP
  885. nc -l -u -p 2000 -c "nc [ip|hostname] 3000"
  886. ```
  887. ___
  888. ##### Tool: [socat](http://www.dest-unreach.org/socat/doc/socat.html/)
  889. ###### Testing remote connection to port
  890. ```bash
  891. socat - TCP4:10.240.30.3:22
  892. ```
  893. * `-` - standard input (STDIO)
  894. * `TCP4:<params>` - set tcp4 connection with specific params
  895. * `[hostname|ip]` - set hostname/ip
  896. * `[1-65535]` - set port number
  897. ###### Redirecting TCP-traffic to a UNIX domain socket under Linux
  898. ```bash
  899. socat TCP-LISTEN:1234,bind=127.0.0.1,reuseaddr,fork,su=nobody,range=127.0.0.0/8 UNIX-CLIENT:/tmp/foo
  900. ```
  901. * `TCP-LISTEN:<params>` - set tcp listen with specific params
  902. * `[1-65535]` - set port number
  903. * `bind=[hostname|ip]` - set bind hostname/ip
  904. * `reuseaddr` - allows other sockets to bind to an address
  905. * `fork` - keeps the parent process attempting to produce more connections
  906. * `su=nobody` - set user
  907. * `range=[ip-range]` - ip range
  908. * `UNIX-CLIENT:<params>` - communicates with the specified peer socket
  909. * `filename` - define socket
  910. ___
  911. ##### Tool: [lsof](https://en.wikipedia.org/wiki/Lsof)
  912. ###### Show process that use internet connection at the moment
  913. ```bash
  914. lsof -P -i -n
  915. ```
  916. ###### Show process that use specific port number
  917. ```bash
  918. lsof -i tcp:443
  919. ```
  920. ###### Lists all listening ports together with the PID of the associated process
  921. ```bash
  922. lsof -Pan -i tcp -i udp
  923. ```
  924. ###### List all open ports and their owning executables
  925. ```bash
  926. lsof -i -P | grep -i "listen"
  927. ```
  928. ###### Show all open ports
  929. ```bash
  930. lsof -Pnl -i
  931. ```
  932. ###### Show open ports (LISTEN)
  933. ```bash
  934. lsof -Pni4 | grep LISTEN | column -t
  935. ```
  936. ###### List all files opened by a particular command
  937. ```bash
  938. lsof -c "process"
  939. ```
  940. ###### View user activity per directory
  941. ```bash
  942. lsof -u username -a +D /etc
  943. ```
  944. ___
  945. ##### Tool: [netstat](https://en.wikipedia.org/wiki/Netstat)
  946. ###### Graph # of connections for each hosts
  947. ```bash
  948. 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 "" }'
  949. ```
  950. ###### Monitor open connections for specific port including listen, count and sort it per IP
  951. ```bash
  952. watch "netstat -plan | grep :443 | awk {'print \$5'} | cut -d: -f 1 | sort | uniq -c | sort -nk 1"
  953. ```
  954. ___
  955. ##### Tool: [rsync](https://en.wikipedia.org/wiki/Rsync)
  956. ###### Rsync remote data as root using sudo
  957. ```bash
  958. rsync --rsync-path 'sudo rsync' username@hostname:/path/to/dir/ /local/
  959. ```
  960. ___
  961. ##### Tool: [host](https://en.wikipedia.org/wiki/Host_(Unix))
  962. ###### Resolves the domain name (using external dns server)
  963. ```bash
  964. host google.com 9.9.9.9
  965. ```
  966. ###### Checks the domain administrator (SOA record)
  967. ```bash
  968. host -t soa google.com 9.9.9.9
  969. ```
  970. ___
  971. ##### Tool: [dig](https://en.wikipedia.org/wiki/Dig_(command))
  972. ###### Resolves the domain name (short output)
  973. ```bash
  974. dig google.com +short
  975. ```
  976. ###### Lookup NS record for specific domain
  977. ```bash
  978. dig @9.9.9.9 google.com NS
  979. ```
  980. ###### Query only answer section
  981. ```bash
  982. dig google.com +nocomments +noquestion +noauthority +noadditional +nostats
  983. ```
  984. ###### Query ALL DNS Records
  985. ```bash
  986. dig google.com ANY +noall +answer
  987. ```
  988. ###### DNS Reverse Look-up
  989. ```bash
  990. dig -x 172.217.16.14 +short
  991. ```
  992. ##### Tool: [dns-other](https://github.com/trimstray/awesome-ninja-admins#tool-dns-other)
  993. ###### Resolves domain name from dns.google.com with curl and jq
  994. ```bash
  995. curl -s "https://dns.google.com/resolve?name=google.com&type=A" | jq .
  996. ```
  997. <a name="programming"><b>Programming</b></a>
  998. ##### Tool: [awk](http://www.grymoire.com/Unix/Awk.html)
  999. ###### Remove duplicate entries in a file without sorting
  1000. ```bash
  1001. awk '!x[$0]++' filename
  1002. ```
  1003. ###### Exclude multiple columns using AWK
  1004. ```bash
  1005. awk '{$1=$3=""}1' filename
  1006. ```
  1007. ___
  1008. ##### Tool: [sed](http://www.grymoire.com/Unix/Sed.html)
  1009. ###### To print a specific line from a file
  1010. ```bash
  1011. sed -n 10p /path/to/file
  1012. ```
  1013. ###### Remove a specific line from a file
  1014. ```bash
  1015. sed -i 10d /path/to/file
  1016. ```
  1017. ###### Remove a range of lines from a file
  1018. ```bash
  1019. sed -i <file> -re '<start>,<end>d'
  1020. ```
  1021. ___
  1022. ##### Tool: [grep](http://www.grymoire.com/Unix/Grep.html)
  1023. ###### Search for a "pattern" inside all files in the current directory
  1024. ```bash
  1025. grep -RnisI "pattern" *
  1026. fgrep "pattern" * -R
  1027. ```
  1028. ###### Remove blank lines from a file and save output to new file
  1029. ```bash
  1030. grep . filename > newfilename
  1031. ```
  1032. ###### Except multiple patterns
  1033. ```bash
  1034. grep -vE '(error|critical|warning)' filename
  1035. ```
  1036. ###### Show data from file without comments
  1037. ```bash
  1038. grep -v ^[[:space:]]*# filename
  1039. ```
  1040. ###### Show data from file without comments and new lines
  1041. ```bash
  1042. egrep -v '#|^$' filename
  1043. ```