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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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shell function to underline a given string.

underline() will print $1, followed by a series of '=' characters the width of $1. An optional second argument can be used to replace '=' with a given character. This function is useful for breaking lots of data emitted in a for loop into sections which are easier to parse visually. Let's say that 'xxxx' is a very common pattern occurring in a group of CSV files. You could run $ grep xxxx *.csv This would print the name of each csv file before each matching line, but the output would be hard to parse visually. $ for i in *.csv; do printf "\n"; underline $i; grep "xxxx" $i; done Will break the output into sections separated by the name of the file, underlined.

Recursive Search and Replace

Finds the string in every file in an entire directory and all its subdirectories and replaces it with a new string. Especially useful when changing a machine's IP address or hostname - run it on /etc.

Kill XMMS for a cron job

Turns red the stderr output

Reference: http://stackoverflow.com/a/4455706

Create package dependency graph

Create Debian package dependency graph using GraphViz

count how many times a string appears in a (source code) tree

grep -o puts each occurrence in a separate line

Convert seconds to [DD:][HH:]MM:SS

Converts any number of seconds into days, hours, minutes and seconds. sec2dhms() { declare -i SS="$1" D=$(( SS / 86400 )) H=$(( SS % 86400 / 3600 )) M=$(( SS % 3600 / 60 )) S=$(( SS % 60 )) [ "$D" -gt 0 ] && echo -n "${D}:" [ "$H" -gt 0 ] && printf "%02g:" "$H" printf "%02g:%02g\n" "$M" "$S" }

File rotation without rename command

Rotates log files with "gz"-extension in a directory for 7 days and enumerates the number in file name. i.e.: logfile.1.gz > logfile.2.gz I needed this line due to the limitations on AIX Unix systems which do not ship with the rename command.

Create a single-use TCP (or UDP) proxy

Redirect the local port 2000 to the remote port 3000. The same but UDP: $ nc -u -l -p 2000 -c "nc -u example.org 3000" It may be used to "convert" TCP client to UDP server (or viceversa): $ nc -l -p 2000 -c "nc -u example.org 3000"

Quickly add a new user to all groups the default user is in

This is a standard procedure for me, whenever I set up a new Raspberry Pi system. Because the default user is "pi", I quickly replace it with my own (e.g. "kostis"), but I have to substitute that user to all of pi's groups first, before deleting the default account. xargs helps a lot with that in a single line, while avoiding boring "for" loops. For everything trickier, there's always "parallel" :)

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