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      README.md

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@@ -250,6 +250,9 @@ performance of any of your sites from across the globe.<br>
* [terminal](#tool-terminal)
* [mount](#tool-mount)
* [fuser](#tool-fuser)
* [ps](#tool-ps)
* [find](#tool-find)
* [diff](#tool-diff)
- **[HTTP/HTTPS](#http-https)**
* [curl](#tool-curl)
* [httpie](#tool-httpie)
@@ -265,6 +268,8 @@ performance of any of your sites from across the globe.<br>
* [netstat](#tool-nestat)
- **[Programming](#programming)**
* [awk](#tool-awk)
* [sed](#tool-sed)
* [grep](#tool-grep)

<a name="system"><b>System</b></a>

@@ -276,12 +281,18 @@ performance of any of your sites from across the globe.<br>
disown -a && exit
```

###### Drop shell history
###### Exit without saving shell history

```bash
kill -9 $$
```

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

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

###### List of commands you use most often

```bash
@@ -307,6 +318,12 @@ vim scp://user@host//etc/fstab
```
___

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

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

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

###### Mount a temporary ram partition
@@ -328,6 +345,42 @@ ___
fuser -k filename
```

___

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

###### Show a 4-way scrollable process tree with full details

```bash
ps awwfux | less -S
```

___

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

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

```bash
find / -mmin 60 -type f
```

###### Find all files larger than 20M

```bash
find / -type f -size +20M
```

___

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

###### Compare two directory trees

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

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

##### Tool: [curl](https://curl.haxx.se)
@@ -398,6 +451,16 @@ ssh user@host cat /path/to/remotefile | diff /path/to/localfile -
ssh -t reachable_host ssh unreachable_host
```

###### Run command over ssh on remote host

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

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

___

##### Tool: [linux-dev](https://www.tldp.org/LDP/abs/html/devref1.html)
@@ -668,6 +731,8 @@ socat TCP-LISTEN:1234,bind=127.0.0.1,reuseaddr,fork,su=nobody,range=127.0.0.0/8
* `UNIX-CLIENT:<params>` - communicates with the specified peer socket
* `filename` - define socket

___

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

###### Show process that use internet connection at the moment
@@ -676,6 +741,18 @@ socat TCP-LISTEN:1234,bind=127.0.0.1,reuseaddr,fork,su=nobody,range=127.0.0.0/8
lsof -P -i -n
```

###### Show process that use specific port number

```bash
lsof -i tcp:443
```

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

```bash
lsof -Pan -i tcp -i udp
```

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

###### Graph # of connections for each hosts
@@ -693,3 +770,42 @@ netstat -an | grep ESTABLISHED | awk '{print $5}' | awk -F: '{print $1}' | grep
```bash
awk '!x[$0]++' filename
```

###### Exclude multiple columns using AWK

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

___

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

###### To print a specific line from a file

```bash
sed -n 10p /path/to/file
```

###### Remove a specific line from a file

```bash
sed -i 10d /path/to/file
```

___

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

###### Search for a "pattern" inside all files in the current directory

```bash
grep -RnisI "pattern" *
fgrep "pattern" * -R
```

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

```bash
grep . filename > newfilename
```

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