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Clear disk space by retaining only currently running Docker containers and only currently required Docker images.

Useful if your Docker host starts running out of disk space due to Docker debris. You should start by running "sudo docker ps" in order to check that all required containers are in fact running, and fix any that aren't before proceeding to the main event! "sudo docker rm $(sudo docker ps -q -f status=exited)" removes all containers which are no longer running. "sudo docker rmi $(sudo docker images -q -f dangling=true)" removes all Docker images not required for currently running containers.
This is sample output - yours may be different.
0

sudo docker rm $(sudo docker ps -q -f status=exited); sudo docker rmi $(sudo docker images -q -f dangling=true)

Roundand · 2017-04-25 11:29:19 23
show mysql process ids

Show Sample Output
This is sample output - yours may be different.
```
2
3131
3210
5633
6032
6061
6375
6588
6772
7092
7499
7663
```
0

mysql -s -e "show processlist" |awk '{print $1}'

aravind040 · 2009-05-27 07:22:05 5
Search for specific IPs taken form a text file within the apache access log

bnd-ips.txt is a list of IP adresses that is concenated for use as regular expression. Yes, this is still very speedy ;=)
This is sample output - yours may be different.
0

grep -E ":(`cat bnd-ips.txt | sed 's/\./\\./g' | tr '\n' '|'`)" access.log

Cowboy · 2009-07-30 12:54:55 6
Visualizing system performance data

draw `vmstat ` data using gnuplot
This is sample output - yours may be different.
0

vmstat 2 10 | awk 'NR > 2 {print NR, $13}' | gnuplot -e "set terminal png;set output 'v.png';plot '-' u 1:2 t 'cpu' w linespoints;"

Sunng · 2009-09-23 07:19:47 3
Search pattern case insensitive
This is sample output - yours may be different.
0

:/\c{pattern}

yohananov · 2010-03-22 11:23:08 3
List file/directories in order of last accessed, in human readable terms

Especially useful with a command line podcatcher like Mashpodder. Show Sample Output
This is sample output - yours may be different.
```
drwxr-xr-x 2 mark users 4.0K Mar 29 23:01 LottaLinuxLinks
drwxr-xr-x 2 mark users 4.0K Mar 29 21:53 x11r5Radio
drwxr-xr-x 2 mark users 4.0K Mar 29 21:53 TLLTS
drwxr-xr-x 2 mark users 4.0K Mar 29 21:53 Linux.Outlaws.Ogg
```
0

ls -lth podcasts/

ricemark20 · 2011-03-30 18:47:02 3
Quick enter into a single screen session
This is sample output - yours may be different.
0

alias screenr='screen -r $(screen -ls | egrep -o -e '[0-9]+' | head -n 1)'

yababay · 2011-05-12 05:44:39 5
Power cd - Add a couple of useful features to 'cd'

Move efficiently between directories. . This command adds a couple of extra features to cd, without affecting normal use. CDPATH use is also unaffected. It introduces and environment variable CDDIR which is used as an alternate home directory. . Note: I don't want to alter $HOME because then all my dot files will move. . Examples: . cd dir Change directory to "dir" (using CDPATH if necessary) . cd dir/file.txt Change directory to "dir" (containing folder of "file.txt") This allows you to cut'n'paste, or use . CDDIR is unset cd Change directory to $HOME . CDDIR=/home/flatcap/work cd Change directory to /home/flatcap/work . For convenience, put the command, and the following, in your .bashrc or .bash_profile export CDDIR="/home/flatcap/work" alias cdd="CDDIR=$(pwd)" Show Sample Output
This is sample output - yours may be different.
```
~$ export CDDIR=/home/flatcap/work
~$ cd
~/work$ unset CDDIR
~/work$ cd
~$
```
0

cd() { if [ -n "$1" ]; then [ -f "$1" ] && set -- "${1%/*}"; else [ -n "$CDDIR" ] && set -- "$CDDIR"; fi; command cd "$@"; }

flatcap · 2011-06-24 08:48:13 10
find broken symbolic links

find broken symbolic links Show Sample Output
This is sample output - yours may be different.
```
lrwxrwxrwx 1 nobody nobody 43 2010-03-15 13:00 /mnt/retorn -> /opt/retorn
```
0

find . -type l | (while read FN ; do test -e "$FN" || ls -ld "$FN"; done)

pathcl · 2011-08-02 14:48:47 5
Upload documents from linux to MS SHarepoint using curl

Use Curl to upload documents from your linux servers to MS Sharepoint servers.
This is sample output - yours may be different.
0

curl --ntlm -u <your Active-Directory-Domain>/<your-domain-username> -T /path/to/local/$FILE http://sharepoint.url.com/doc/library/dir/

barnesmjsa · 2011-09-08 18:08:58 3
Push to all remote repos with git
This is sample output - yours may be different.
0

git remote | xargs -n 1 git push

rickard2 · 2012-02-11 17:41:52 3
pdftk append with handles
This is sample output - yours may be different.
0

pdftk A=1.pdf B=2.pdf C=3.pdf cat C A output CA.pdf

bossNova · 2012-03-28 15:41:44 22
List all symlinks and see where they link to
This is sample output - yours may be different.
0

find -type l | xargs ls -l

samer · 2012-05-15 22:34:51 3
Find the 10 lusers winners of the "I take up the most disk space" award

the -h option of du and sort (on appropriate distrib) makes output "Human" readable and still sorted by "reversed size" (sort -rh) Show Sample Output
This is sample output - yours may be different.
```
55G	/home/user32
19G	/home/user45
6.7G	/home/user89
16M	/home/user02
64K	/home/user57
```
0

du -sh /home/*|sort -rh|head -n 10

toaster · 2012-09-12 11:54:06 5
avoid ssh hangs using jobs

Execute commands serially on a list of hosts. Each ssh connection is made in the background so that if, after five seconds, it hasn't closed, it will be killed and the script will go on to the next system. Maybe there's an easier way to set a timeout in the ssh options...
This is sample output - yours may be different.
0

for host in $MYHOSTS; do ping -q -c3 $H 2>&1 1>/dev/null && ssh -o 'AllowedAuthe ntications publickey' $host 'command1; command2' & for count in 1 2 3 4 5; do sleep 1; jobs | wc -l | grep -q ^0\$ && continue; done; kill %1; done

a8ksh4 · 2012-11-13 23:12:27 5
Go get those photos from a Picasa album (full size)
This is sample output - yours may be different.
0

wget -O - "[PICASA ALBUM RSS LINK]" |sed 's/</\n</g' | grep media:content |sed 's/.*url='"'"'$[^'"'"']*$'"'"'.*$/\1/' |awk -F'/' '{gsub($NF,"d/"$NF); print $0}'|wget -i -

mxac · 2013-03-16 15:48:41 4
vi show line numbers

Prints line numbers making it easier to see long lines that wrap in your terminal and extra line breaks at the end of a file. :set nu works too. Show Sample Output
This is sample output - yours may be different.
```
1 sample text file
2 blah blah blah
3 last line
4
```
0

:set number

sonic · 2013-10-07 15:03:52 6
Remove all .DS_Store files from the current directory (recursive)

May require GNU find.
This is sample output - yours may be different.
0

find . -name "*.DS_Store" -type f -delete

nicolasmccurdy · 2014-07-16 02:03:38 8
This command uses dd, pv, and dialog command to display an updated progress bar while using the dd command. This is useful to see the status of a dd in progress when creating very large dumps or coping hard disk devices using dd command.
This is sample output - yours may be different.
0

(pv -n /dev/sda | dd of=/dev/sdb bs=128M conv=notrunc,noerror) 2>&1 | dialog --gauge "Running dd command (cloning), please wait..." 10 70 0

skinners · 2014-11-07 16:24:26 13
function: permanent alias

Yes, it is not a command. Yes, you need to add it to your init script. Yes, you need to define $SH_ALIASES filename. But this shit can be very useful.
This is sample output - yours may be different.
0

function cmd () {echo 'alias '$1'="'${@:2}'"' >> $SH_ALIASES; . $SH_ALIASES }; . $SH_ALIASES;

romgrk · 2015-06-28 21:21:52 9
Diff two directories by finding and comparing the md5 checksums of their contents.

Results will be shown in columns. Only different files and files in one directory that is not in the other will be shown.
This is sample output - yours may be different.
0

diff -y --suppress-common-lines <(sort -k2 <(md5deep -r -b directory1)) <(sort -k2 <(md5deep -r -b directory2))

MeLoPasoPipa · 2016-08-18 09:17:16 12
Make color transparent
This is sample output - yours may be different.
0

mogrify -path ../png_transparent/ -fuzz 3.4% -transparent "#50566b" *.png

ceddi · 2016-10-17 19:49:04 17
Display which distro is installed

Cleaner than the top alternative Show Sample Output
This is sample output - yours may be different.
```
Distributor ID:	Debian
Description:	Debian GNU/Linux 8.7 (jessie)
Release:	8.7
Codename:	jessie
```
0

test `uname` = Linux && lsb_release -a 2>/dev/null || ( test `uname` = SunOS && cat /etc/release || uname -rms )

amhhhhhhh · 2017-04-25 13:35:40 21
Silently Execute a Shell Script that runs in the background and won't die on HUP/logout
This is sample output - yours may be different.
0

(nohup your-command your-args &>/dev/null &)

socketz · 2018-05-23 17:35:43 197
Force file system check
This is sample output - yours may be different.
0

touch /forcefsk

rimaya · 2009-02-06 09:19:46 11
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More precise BASH debugging

Pipe stdout and stderr, etc., to separate commands

You can use [n]> combined with >(cmd) to attach the various output file descriptors to be the input of different commands.

Install a basic FreeBSD system

Install a basic FreeBSD system on a distant server. I use this to install FreeBSD on servers that can only boot a Linux rescue system. This sytem loads on ram when booted, so it is possible to install freely. You can even install on ZFS root !

lazy SQL QUERYING

This is regarding the command 8263 using an alias to fill in command line options for psql. You can actually just type 'psql'. In order for that to work, you want to set environment variables PGDATABASE, PGHOST, PGUSER, and (except you're using the default) PGPORT. Also, you can add a line "host:port:dbname:user:password" (asterisk ok in some columns) to your ~/.pgpass file. Finally, if you don't like the aligned columns, you can add the line "\pset format unaligned" to your ~/.psqlrc file.

Convert tab separate file (TSV) to JSON with jq

With this command you can convert a tab separate file (TSV) into a JSON file with jq. For example, this input.tsv i-0b9adca882e5e6326 172.16.0.188 i-088dd69e5c3624888 172.16.0.102 i-0e70eac180537d4aa 172.16.0.85 will produce the showed output.

Simple MAC Changeing

The 00:11:22:33:44:55 is whatever you want your new MAC address to be. Sometimes sudo should be used in front if you need to.

convert single digit to double digits

each number in a file name gets expanded to the number of digets provided as arg_1 of the arguments in rjust_file_nums. Put the funciton in the .bashrc file. Be sure to $ source ~/.bashrc so that the function will be accessible from bash.

ps a process keeping the header info so you know what the columns of numbers mean!

USER PID %CPU %MEM VSZ RSS TTY STAT START TIME COMMAND root 1828 0.0 0.0 5396 476 ? Ss 2008 0:00 /usr/sbin/sshd

What is the use of this switch ?

Find the usage of a switch with out searching through the entire man page. Usage: manswitch [cmd] [switch] Eg: $manswitch grep silent ____________________________ In simple words $man | grep "\-" Eg: $man grep | grep "\-o" This is not a standard method but works.

shush MOTD

I'm annoyed by the boilerplate "don't login unless you are supposed messages in our environment" - this shuts them up.

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