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updated one-liners

- signed-off-by: trimstray <trimstray@gmail.com>
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trimstray 4 years ago
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@@ -253,6 +253,9 @@ performance of any of your sites from across the globe.<br>
* [ps](#tool-ps)
* [find](#tool-find)
* [diff](#tool-diff)
* [tail](#tool-tail)
* [cpulimit](#tool-cpulimit)
* [pwdx](#tool-pwdx)
- **[HTTP/HTTPS](#http-https)**
* [curl](#tool-curl)
* [httpie](#tool-httpie)
@@ -287,6 +290,12 @@ disown -a && exit
kill -9 $$
```

###### Perform a branching conditional

```bash
true && { echo success;} || { echo failed; }
```

###### Pipe stdout and stderr to separate commands

```bash
@@ -316,7 +325,6 @@ rm !(*.foo|*.bar|*.baz)
```bash
vim scp://user@host//etc/fstab
```
___

###### Create a directory and change into it at the same time

@@ -324,6 +332,14 @@ ___
mkd () { mkdir -p "$@" && cd "$@"; }
```

###### Convert uppercase files to lowercase files

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

___

##### Tool: [mount](https://curl.haxx.se)

###### Mount a temporary ram partition
@@ -355,6 +371,12 @@ ___
ps awwfux | less -S
```

###### Processes per user counter

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

___

##### Tool: [find](https://curl.haxx.se)
@@ -381,6 +403,46 @@ ___
diff <(cd directory1 && find | sort) <(cd directory2 && find | sort)
```

___

##### Tool: [tail](https://curl.haxx.se)

###### Annotate tail -f with timestamps

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

###### Analyse an Apache access log for the most common IP addresses

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

##### Tool: [cpulimit](https://curl.haxx.se)

###### Limit the cpu usage of a process

```bash
cpulimit -p pid -l 50
```

##### Tool: [pwdx](https://curl.haxx.se)

###### Show current working directory of a process

```bash
pwdx <pid>
```

##### Tool: [taskset](https://curl.haxx.se)

###### Start a command on only one CPU core

```bash
taskset -c 0 <command>
```

<a name="http-https"><b>HTTP/HTTPS</b></a>

##### Tool: [curl](https://curl.haxx.se)
@@ -614,6 +676,12 @@ server> nc -l 5000 -e /bin/bash
client> nc 10.240.30.3 5000
```

###### Simple file server

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

###### Simple HTTP Server

> Restarts web server after each request - remove `while` condition for only single connection.
@@ -700,6 +768,22 @@ 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

```bash
### 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](http://www.dest-unreach.org/socat/doc/socat.html/)
@@ -753,6 +837,12 @@ lsof -i tcp:443
lsof -Pan -i tcp -i udp
```

###### List all files opened by a particular command

```bash
lsof -c "process"
```

**Tool: [netstat](http://www.dest-unreach.org/socat/doc/socat.html/)**

###### Graph # of connections for each hosts


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