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Unmuting master channel, printing only percent value, while suppressing other outputs
This is sample output - yours may be different.
0

amixer -c 0 set Master toggle | tail -1 | awk '{print $4}' | sed "s/[^0-9]//g" ; amixer -c 0 set Speaker toggle >/dev/null; amixer -c 0 set Front toggle >/dev/null

dtsip · 2012-06-26 21:18:07 5
UDP over SSH

Forward local UDP port to remotetarget via ssh.
This is sample output - yours may be different.
0

socat udp-listen:1611 system:'ssh remoteserver "socat stdio udp-connect:remotetarget:161"'

kbo · 2013-07-02 15:08:14 5
walk in a directory for specific files and copy it to desired destination

helpful when you see something like this: zsh: argument list too long: cp
This is sample output - yours may be different.
0

for file in ./data/message-snapshots/*.jpg; do cp "$file" /data/digitalcandy/ml/images/; done

ferdous · 2014-06-14 17:26:21 6
Opens Windows internet shortcut files (*.url files) in Firefox.

This command will use grep to read the shortcut (which in the above examle is file.url), and filter out all but the only important line, which contains the website URL, and some extra characters that will need to be removes (for example, URL=http://example.com). The cut command is then used to get rid of the URL= at the beginning. The output is then piped into Firefox, which should interpret the it as a web URL to be opened. Of course, you can replace Firefox with any other broswer. Tested in bash and sh.
This is sample output - yours may be different.
0

firefox "$(grep -i ^url=* file.url | cut -b 5-)"

nachos117 · 2014-10-08 05:56:27 8
check port open without telnet
This is sample output - yours may be different.
0

nc 127.0.0.1 22 < /dev/null; echo $?

kankan55 · 2015-01-20 04:55:51 9
Display how much memory installed on system

This will display the system memory size in kb. If you want to see the value in mb, you can type: grep MemTotal: /proc/meminfo | awk '{printf("MemTotal: %d MB\n",$2/1024)}' Show Sample Output
This is sample output - yours may be different.
```
$ grep MemTotal: /proc/meminfo
MemTotal:       16385508 kB
```
0

grep MemTotal: /proc/meminfo # display how much memory installed

mpb · 2015-05-15 09:19:02 17
list the open files for a particular process ID
This is sample output - yours may be different.
0

lsof -p PID

blasetherexaler · 2015-11-11 02:55:39 11
bulk rename files with GNU Parallel

Works with any file name: space, ', " and even \n is OK. The code in {= =} is a perl expression.
This is sample output - yours may be different.
0

parallel -0 mv {} {=s/foo/bar/g=} ::: *

unixmonkey91589 · 2015-12-25 17:22:43 12
Find the top most 5 duplicate files in a folder

To allow recursivity : find -type f -exec md5sum '{}' ';' | sort | uniq -c -w 33 | sort -gr | head -n 5 | cut -c1-7,41- Display only filenames : find -maxdepth 1 -type f -exec md5sum '{}' ';' | sort | uniq -c -w 33 | sort -gr | head -n 5 | cut -c43- Show Sample Output
This is sample output - yours may be different.
```
     50 ./file17.txt
     32 ./file44.txt
     11 ./file72.txt
      5 ./file29.txt
      3 ./file53.txt
```
0

find -maxdepth 1 -type f -exec md5sum '{}' ';' | sort | uniq -c -w 33 | sort -gr | head -n 5 | cut -c1-7,41-

MaDCOw · 2017-02-09 11:36:31 18
Execute the last line of output from the previous command

alex@alex-box:~$ sl The program 'sl' is currently not installed. You can install it by typing: sudo apt-get install sl alex@alex-box:~$ dolast Reading package lists... Done Building dependency tree Reading state information... Done The following NEW packages will be installed: sl 0 upgraded, 1 newly installed, 0 to remove and 0 not upgraded.
This is sample output - yours may be different.
0

alias dolast='$( $(history 2| head -n 1| sed "s/.* //") 2>&1 | tail -n 1)'

aheinous · 2017-02-25 01:26:49 19
Change all the files on your system that have the OLDGID group by the new NEWGID.

It's change the group id of all the files on your system that have the OLDGID group as the owner group by the new NEWGID. But first do this: Document which files will be changed, use: find / -gid OLDGID ! -type l > resplado-gid.txt Be sure to disconnect users from the old group. Stop demons or services associated with the group. Be sure the new group exist and take note of GID
This is sample output - yours may be different.
0

$ find / -gid OLDGID ! -type l -exec chgrp NEWGID {} \;

rcorrea · 2017-08-09 21:37:51 18
Remove multiple entries of the same command in .bash_history with preserving the chronological order

Only the first appearance of a repeated command in the history will be kept. Otherwise, if you prefer to keep last occurrence of a repeated command then maybe you can achieve that by including reverse input/output i.e with 'tac' command in expression above. To see statistics of removed repeated commands: diff --suppress-common-lines -y ~/.bash_history.bak ~/.bash_history|uniq -c|sort -n|tr -s " "|sed '/^ 1/d'|grep '<'
This is sample output - yours may be different.
0

cp -a ~/.bash_history ~/.bash_history.bak && perl -ne 'print unless $seen{$_}++' ~/.bash_history.bak >~/.bash_history

knoppix5 · 2019-04-15 12:39:09 71
Rotate the X screen via xrandr

You need the RANDR support enable, to enable it with an ATI card run: aticonfig --set-pcs-str="DDX,EnableRandr12,TRUE" To show your available output run: xrandr -q -d [yourdisplay]
This is sample output - yours may be different.
0

xrandr --output [youroutput] --rotate [right|left|normal] -d [yourdisplay]

michelem · 2009-02-05 18:28:43 29
Top like mysql monitor

mytop is a top like monitor for displaying Mysql server statistic and performance. Part of mytop package ,tested on Debian.
This is sample output - yours may be different.
0

mytop --prompt

servermanaged · 2009-05-19 19:04:57 5
Grep through the text of djvu files and format results

Count the occurences of the word 'Berlekamp' in the DJVU files that are in the current directory, printing file names from the one having the least to the most occurences.
This is sample output - yours may be different.
0

find ./ -iname "*.djvu" -execdir perl -e '@s=`djvutxt \"$ARGV[0]\"\|grep -c Berlekamp`; chomp @s; print $s[0]; print " $ARGV[0]\n"' '{}' \;|sort -n

unixmonkey4437 · 2010-04-07 11:15:26 8
Check whether laptop is running on battery or cable
This is sample output - yours may be different.
0

cat /proc/acpi/ac_adapter/ACAD/state

takeshin · 2010-06-10 08:02:09 4
resize all JPG images in folder and create new images (w/o overwriting)
This is sample output - yours may be different.
0

ls *.JPG | cut -d . -f 1 | xargs -L1 -i convert -resize 684 {}.JPG {}.jpg

homoludens · 2010-09-12 19:47:38 3
Untar a directory in a tar file over ssh

This may be listed already but this command is useful to untar a specific directory to a different server.
This is sample output - yours may be different.
0

cat tarfile.tar.gz | ssh server.com " cd /tmp; tar xvzf - directory/i/want"

alf · 2011-02-11 17:10:01 4
Convert vcd to avi format

Convert VCD to .AVI
This is sample output - yours may be different.
0

mencoder vcd://2 -o sample.avi -oac copy -ovc lavc -lavcopts vcodec=mpeg4

mmghaseminya · 2011-10-02 17:25:14 3
Get the total length of all video / audio in the current dir (and below) in H:m:s

Improvement on Coderjoe's Solution. Gets rid of grep and cut (and implements them in awk) and specifies some different mplayer options that speed things up a bit. Show Sample Output
This is sample output - yours may be different.
```
02:23:58
```
0

find /path/to/dir -iname "*.ext" -print0 | xargs -0 mplayer -really-quiet -cache 64 -vo dummy -ao dummy -identify 2>/dev/null | awk '/ID_LENGTH/{gsub(/ID_LENGTH=/,"")}{SUM += $1}END{ printf "%02d:%02d:%02d\n",SUM/3600,SUM%3600/60,SUM%60}'

DarkSniper · 2012-03-11 12:28:48 3
Find a file with a certail date stamp
This is sample output - yours may be different.
0

cp -p `ls -l | awk '/Apr 14/ {print $NF}'` /usr/users/backup_dir

akashrpatel · 2012-12-27 19:12:08 4
Shutdown ubuntu
This is sample output - yours may be different.
0

sudo shutdown -h now

permanaj · 2013-04-23 02:34:48 5
Gets the X11 Screen resolution
This is sample output - yours may be different.
0

xdpyinfo | grep dimensions | awk '{print $2}'

sgnn7 · 2013-12-06 17:49:40 6
Display thread information in ps
This is sample output - yours may be different.
0

ps m

blasetherexaler · 2015-11-11 02:57:41 9
Recompress all files in current directory from gzip to bzip2

Works even if file name contains \n. Spawns one job per core.
This is sample output - yours may be different.
0

parallel -0 'gzip -dc {} | bzip2 > {.}.bz2' ::: *.gz

unixmonkey91589 · 2015-12-25 17:28:03 9
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Pulls total current memory usage, including SWAP being used, by all active processes.

Force hard reset on server

Useful when you have some wrong on a server (nfs freeze/ immortal process)

List all active access_logs for currently running Apache or Lighttpd process

Ever logged into a *nix box and needed to know which webserver is running and where all the current access_log files are? Run this one liner to find out. Works for Apache or Lighttpd as long as CustomLog name is somewhat standard. HINT: works great as input into for loop, like this: $ for i in `lsof -p $(netstat -ltpn|awk '$4 ~ /:80$/ {print substr($7,1,index($7,"/")-1)}')| awk '$9 ~ /access.log$/ {print $9| "sort -u"}'` ; do echo $i; done Very useful for triage on unfamiliar servers!

Shows what processes need to be restarted after system upgrade

emerge,apt-get,yum... all update your system. This will at some point replace either a runtime dependency or a process (which is still running). This oneliner will list what processes need to be restarted

Download all PDFs from an authenificated website

Replace *** with the appropiate values

Make alias pemanent fast

Simple function to permanently add an alias to your profile. Tested on bash and Ksh, bash version above. Here is the ksh version: PERMA () { print "$@" >> ~/.profile; } Sample usage: PERMA alias la='ls -a'

View Processeses like a fu, fu

I don't truly enjoy many commands more than this one, which I alias to be ps1.. Cool to be able to see the heirarchy and makes it clearer what need to be killed, and whats really going on.

Sort files by size

See system users

Which processes are listening on a specific port (e.g. port 80)

swap out "80" for your port of interest. Can use port number or named ports e.g. "http"

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