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List all groups
This is sample output - yours may be different.
0

cut -d: -f1 /etc/group | sort

sharezlinux · 2014-10-28 08:18:45 6
turn on/off wifi

start wifi connection sudo service network-manager start stop wifi connection sudo service network-manager stop
This is sample output - yours may be different.
0

sudo service network-manager start

asdzxc · 2015-02-08 12:06:16 8
Running qbittorrent-nox without killing it when the terminal closses.

Starts qbittorrent-nox (or any other program) and dettach it from the terminal it was ran in. When you exit, the program keeps running. Show Sample Output
This is sample output - yours may be different.
```
[1] 15448
nohup: es descarta l?entrada i s?afegeix l?eixida a 'nohup.out'
```
0

nohup qbittorrent-nox & disown

darent · 2016-08-01 08:43:42 13
Generate a list of items from a couple of items lists A and B, getting (B - A ) set
This is sample output - yours may be different.
0

comm -13 ItemsListtoAvoid.txt AllItemsList.txt > ItemsDifference.txt

keltroth · 2018-10-29 14:43:16 411
PHP7 - Fix incompatibility errors like: Parse error: syntax error, unexpected new (T_NEW) in file.php on line...

New objects cannot be assigned by reference. The result of the new statement can no longer be assigned to a variable by reference. Check the "Sample Output" example ("sample.php"). The Output of the above example in PHP 5: "Deprecated: Assigning the return value of new by reference is deprecated in sample.php on line 3". Output of the above example in PHP 7: "Parse error: syntax error, unexpected 'new' (T_NEW) in sample.php on line 3. Show Sample Output
This is sample output - yours may be different.
```
echo -e "<?php\nclass C {}\n\$c =& new C;\n?>" > sample.php
cat sample.php
<?php
class C {}
$c =& new C;
?>
busybox sh -c 'find "$(realpath ./)" -type f $ -iname "*.php" -or -iname "*.inc" $ -exec sed -i -r "s~=[[:space:]]*&[[:space:]]*new[[:space:]]+~= new ~gi" {} \; '
cat sample.php
<?php
class C {}
$c  = new C;
?>
```
0

find "$(realpath ./)" -type f $ -iname "*.php" -or -iname "*.inc" $ -exec sed -i -r "s~=[[:space:]]*&[[:space:]]*new[[:space:]]+~= new ~gi" {} \;

mikhail · 2019-05-29 18:20:45 38
Encode a file to MPEG4 format

http://handbrake.fr/
This is sample output - yours may be different.
0

HandBrakeCLI -i video.avi -o video.mp4

hendry · 2010-03-17 21:06:01 3
Ignore a specific subdir, instead of all subdirs, with ack-grep

Say you have a directory structure like "foo/, foo/data/, bar/, bar/data/". If you just want to ignore 'bar/data' and you use "ack --ignore-dir=data pattern" it will ignore both foo/data and bar/data and 'ignore-data=bar/data' etc won't work.
This is sample output - yours may be different.
0

ack -a -G '^(?!.*bar/data.*).*$' pattern

rkulla · 2010-05-10 00:13:11 4
Purge configuration files of removed packages on debian based systems

Lists all packages in "rc" state and purge them one at a time.
This is sample output - yours may be different.
0

dpkg -l | grep ^rc | cut -d' ' -f3 | xargs dpkg -P

cyrusza · 2010-11-22 12:53:31 6
Console clock

Does the same but without a pipe and a new shell.
This is sample output - yours may be different.
0

while sleep 1; do echo -n "\r`date`"; done

nkoehring · 2011-02-15 23:48:37 3
Replace all occurences of a pattern with another one from previous command
This is sample output - yours may be different.
0

!!:gs/foo/bar

nmaupu · 2011-03-23 09:39:24 3
Copy buffer from tmux into OS X clipboard
This is sample output - yours may be different.
0

tmux show-buffer | pbcopy

kejadlen · 2012-02-06 22:20:57 3
Visualize directory structure
This is sample output - yours may be different.
0

tree

pranavkn · 2012-03-20 20:28:03 3
Short Information about loaded kernel modules
This is sample output - yours may be different.
0

lsmod | tail -n +2 | cut -d' ' -f1 | xargs modinfo | egrep '^file|^desc|^dep' | sed -e'/^dep/s/$/\n/g'

vlaad · 2012-09-03 17:59:49 4
chef ssh

runs the specified ssh command on all chef nodes
This is sample output - yours may be different.
0

knife ssh name:* -x ec2-user -i ~/.ssh/aws-west.pem "hostname"

rwilson04 · 2012-11-06 00:14:01 7
find top 20 results in apache statistics for a specific month
This is sample output - yours may be different.
0

awk '/Dec\/2012/ {print $1,$8}' logfile | grep -ivE '(.gif|.jpg|.png|favicon|.css|.js|robots.txt|wp-l|wp-term)' | sort | uniq -c | sort -rn | head -n 20

vaaclav · 2013-04-30 06:51:47 6
Opening & evaluating a SuperCollider file from commandline (Mac)
This is sample output - yours may be different.
0

/Applications/SuperCollider/SuperCollider.app/Contents/Resources/sclang ~/path/to/your/scfile.scd

unixmonkey58441 · 2013-09-25 22:17:58 6
Count music files in each directory

This lists the number of ogg/mp3/wav/flac files in each subdirectory of the current directory. The output can be sorted by piping it into "sort -n". Show Sample Output
This is sample output - yours may be different.
```
9955 .
82 ./16 Horsepower
17 ./17 Hippies
11 ./Abney Park
44 ./AC DC
10 ./Accept
1 ./Acceptance
9 ./Adiemus
6 ./Bran? Ketern?
10 ./Budapest Gypsy Symphony Orchestra
20 ./Budapester Klezmer Band
35 ./Buena Vista Social Club
12 ./Burlap To Cashmere
```
0

find . -type d -maxdepth 1 -print0 | xargs -0 -I{} sh -c 'find "{}" -type f | grep "ogg\|mp3\|wav\|flac$" | wc -l | tr -d "\n"; echo " {}"'

dbrgn · 2013-12-22 13:40:29 11
Get a PostgreSQL servers version

In a multiple PostgreSQL server environment knowing the servers version can be important. Note that psql --version returns just the local psql apps version which may not be what you want. This command dumps the PostgreSQL servers version out to one line. You may need to add more command line options to the psql command for your connection environment. Show Sample Output
This is sample output - yours may be different.
```
PostgreSQL 9.3.3 on x86_64-redhat-linux-gnu, compiled by gcc (GCC) 4.8.2 20131212 (Red Hat 4.8.2-7), 64-bit
```
0

psql -h <SERVER NAME HERE> -c 'SELECT version();' | grep -v 'version\|---\|row\|^ *$' | sed 's/^\s*//'

pnelsonsr · 2014-03-17 18:36:40 7
wget
This is sample output - yours may be different.
0

wget www.google.com

xiruizhifu · 2014-07-04 12:49:37 56
set screen brightness

alias screen-brightness='xbacklight -set' alias screen-off='xset dpms force standby' alias screen-min='xbacklight -set 1' alias screen-max='xbacklight -set 100' alias screen-inc='xbacklight -inc 10' alias screen-dec='xbacklight -dec 10'
This is sample output - yours may be different.
0

xbacklight -set 100

asdzxc · 2015-02-08 12:12:16 8

Show a git log with offsets relative to HEAD

This is how you can do this without having to use oneline Show Sample Output

git log | nl -w9 -v0 --body-numbering='pcommit\ [0-9a-f]\{40\}' | sed 's/^ \+$[0-9]\+$\s\+/HEAD~\1 /'

guywithnose · 2015-11-23 21:53:33 10

Diff two directories by finding and comparing the md5 checksums of their contents.

As output, checksums and filenames will be printed.
This is sample output - yours may be different.
0

diff <(sort <(md5deep -r /directory/1/) | awk -F '/' '{print $1 $NF}') <(sort <(md5deep -r /directory/2/) | awk -F '/' '{print $1 $NF}')

linux_noob · 2016-06-06 20:05:01 11
Open search engines from terminal

Use duckduckgo from terminal: ddg commandline one liners Want Google instead? :P lmgtfy(){ ARGS="$@"; xdg-open "http://www.lmgtfy.com/?q=${ARGS}#"; } lmgtfy "What the f*** is lmgtfy?" Or just: google(){ ARGS="$@"; xdg-open "https://www.gooogle.com/search?q=${ARGS}"; } google Please Google, take my soul
This is sample output - yours may be different.
0

ddg(){ ARGS="$@"; xdg-open "https://www.duckduckgo.com/?q=${ARGS}"; }

BigZ · 2016-08-01 20:56:07 13
Incremental Backup via rsync

This command will backup the entire / directory, excluding /dev, /proc, /sys, /tmp, /run, /mnt, /media, /lost+found directories. Let us break down the above command and see what each argument does. rsync: A fast, versatile, local and remote file-copying utility -aAXv: The files are transferred in ?archive? mode, which ensures that symbolic links, devices, permissions, ownerships, modification times, ACLs, and extended attributes are preserved. -/: Source directory -exclude: Excludes the given directories from backup. -/mnt: It is the backup destination folder. Please be mindful that you must exclude the destination directory, if it exists in the local system. It will avoid the an infinite loop. To restore the backup, just reverse the source and destination paths in the above command.
This is sample output - yours may be different.
0

rsync -aAXv / --exclude={"/dev/*","/proc/*","/sys/*","/tmp/*","/run/*","/mnt/*","/media/*","/home/*","/lost+found/*"} <backup path> > <path_of log file>

vinabb · 2017-07-26 13:33:50 18
Show a clock in the upper right corner

This will use tput to place the command (date %T in this case) in the upper right corner of the terminal
This is sample output - yours may be different.
0

while sleep 1;do tput sc;tput cup 0 $(($(tput cols)-11));echo -e "\e[31m`date +%T`\e[39m";tput rc;done &

x3mboy · 2017-11-16 18:07:39 19
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MPD + Digitally Imported

1.- Enter into the playlist path. 2.- Run the command. 3.- Playlists created!

The Hidden PS

While going through the source code for the well known ps command, I read about some interesting things.. Namely, that there are a bunch of different fields that ps can try and enumerate for you. These are fields I was not able to find in the man pages, documentation, only in the source. Here is a longer function that goes through each of the formats recognized by the ps on your machine, executes it, and then prompts you whether you would like to add it or not. Adding it simply adds it to an array that is then printed when you ctrl-c or at the end of the function run. This lets you save your favorite ones and then see the command to put in your .bash_profile like mine at : http://www.askapache.com/linux-unix/bash_profile-functions-advanced-shell.html Note that I had to do the exec method below in order to pause with read. t () { local r l a P f=/tmp/ps c='command ps wwo pid:6,user:8,vsize:8,comm:20' IFS=' '; trap 'exec 66

Remove all unused kernels with apt-get

Remove old kernels (*-generic and *-generic-pae) via apt-get on debian/ubuntu based systems. Tested on ubuntu 10.04 - 12.04.

Unzip and untar a *.tar.gz file in one go to a specific directory

A *.tar.gz file needs to be unzipped & then untarred. Previously I might have unzipped first with $gunzip -d file.tar.gz and then untarred the result with $tar -xvf file.tar (Options are extract, verbose, file) Using the -z (decompress) option on tar avoids the use of gzip (or gunzip) first. Additionally the -C option will specify the directory to extract to.

Create a file of a given size in linux

If you're trying to create a sparse file, you can use dd by 'skip'ing to the last block instance. ls -ls shows the actual size vs. the reported size

Instant mirror from your laptop + webcam (fullscreen+grab)

This directly puts the "mirror" into fullscreen, and lets you take photos by pressing the 's' key. I bet appearance conscious people will have keyboard shortcut for this command by now.

generate a telephone keypad

Draw a telephone keyboard, using just a shell built-in command.

iso to USB with dd and show progress status

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"

Gets the X11 Screen resolution

Requires xrandr, grep and, sed.

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