All commands sorted by votes | commandlinefu.com

Hide

What's this?

commandlinefu.com is the place to record those command-line gems that you return to again and again.

Delete that bloated snippets file you've been using and share your personal repository with the world. That way others can gain from your CLI wisdom and you from theirs too. All commands can be commented on, discussed and voted up or down.

Get involved!

You can sign-in using OpenID credentials, or register a traditional username and password.

OpenID

First-time OpenID users will be automatically assigned a username which can be changed after signing in.

UpGuard checks and validates configurations for every major OS, network device, and cloud provider.

Hide

Stay in the loop…

Follow the Tweets.

Every new command is wrapped in a tweet and posted to Twitter. Following the stream is a great way of staying abreast of the latest commands. For the more discerning, there are Twitter accounts for commands that get a minimum of 3 and 10 votes - that way only the great commands get tweeted.

» http://twitter.com/commandlinefu
» http://twitter.com/commandlinefu3
» http://twitter.com/commandlinefu10

Subscribe to the feeds.

Use your favourite RSS aggregator to stay in touch with the latest commands. There are feeds mirroring the 3 Twitter streams as well as for virtually every other subset (users, tags, functions,…):

Subscribe to the feed for:

» all commands
» commands with 3 up-votes (commandlinefu3)
» commands with 10 up-votes (commandlinefu10)

Hide

News

May 19, 2015 - A Look At The New Commandlinefu: I've put together a short writeup on what kind of newness you can expect from the next iteration of clfu. Check it out here.
March 2, 2015 - New Management: I'm Jon, I'll be maintaining and improving clfu. Thanks to David for building such a great resource!

Hide

Top Tags

awk, bash, curl, find, grep, Linux, sed

Hide

Functions

Terminal - All commands - 12,420 results

2011-09-08 18:54:36

User: brando56894

Functions: echo grep head netstat sudo tail

Tags: netstat udp tcp connections

Up
Down

Displays All TCP and UDP Connections

Comments (0) | Add to favourites | Report as malicious | Submit alternative | Report as a duplicate

echo foobar | sed -r 's/(^.|.$)//g'

2011-11-19 16:19:07

User: ebraminio

Functions: echo sed

Tags: bash sed

Up
Down

Remove the first and the latest caracter of a string

Just an other solution :)

Comments (0) | Add to favourites | Report as malicious | Submit alternative | Report as a duplicate

(sed 's/^/x*=/' file ; echo x) | bc

2012-01-03 13:45:25

User: fallen3angel

Functions: echo file sed

Up
Down

Fast way to get the product of every number in a file

Comments (0) | Add to favourites | Report as malicious | Submit alternative | Report as a duplicate

DATE=`date +"%H:%M" --date '-1 min'`; egrep "\ $DATE\:..\ " /var/log/dhcpd.log |awk '/DHCPREQUEST/ {split($3,t,":"); printf("%02d:%02d\n",t[1],t[2]);}' |uniq -c;

2013-03-17 02:23:37

User: jobewan

Functions: awk egrep uniq

Up
Down

Display count of log entries via the previous minute for graphing purposes. Example given is for DHCPREQUESTS on an ISC dhcp service log.

Comments (0) | Add to favourites | Report as malicious | Submit alternative | Report as a duplicate

hexdump -C file

2013-05-07 20:40:02

User: qistoph

Functions: hexdump

Up
Down

Hex Dump

Comments (0) | Add to favourites | Report as malicious | Submit alternative | Report as a duplicate

(date "+%d-%m-%Y %H:%M:%S";curl -s --interface lo:1 ifconfig.me| xargs -t geoiplookup 2>&1)|sed -e 's/geoiplookup/IP:/g' -e 's/GeoIP Country Edition/Country/g'|tr -s "\n" " "|sed 'a\ '

2013-10-07 15:28:55

User: guerito

Functions: date sed tr xargs

Up
Down

Localize a Public IP on a specific interface

My first command :) I made this command to log public addresses of a virtual interface who connects random VPN servers around the world.

command_line 2>&1 | tee -a output_file

2014-04-05 13:02:30

User: esplinter

Functions: tee

Tags: tee redirect

Up
Down

redirect STDOUT and STDERR to STDOUT and also to a file

Comments (0) | Add to favourites | Report as malicious | Submit alternative | Report as a duplicate

git log --graph --decorate --pretty=oneline --abbrev-commit

2014-07-16 02:07:23

User: nicolasmccurdy

Up
Down

My git log alias

Comments (0) | Add to favourites | Report as malicious | Submit alternative | Report as a duplicate

for f in input/*; do BN=$(basename "$f"); ffmpeg -i "$f" -vn "temp/$BN.flac"...

2015-03-01 02:48:19

User: samcamwilliams

Functions: basename

Up
Down

Remove excess noise from a set of mp4 videos.

Full command:

for f in input/*; do BN=$(basename "$f"); ffmpeg -i "$f" -vn "temp/$BN.flac"; sox "temp/$BN.flac" "temp/$BN-cleaned.flac" noisered profile 0.3; ffmpeg -i "$f" -vcodec copy -an "temp/$BN-na.mp4"; ffmpeg -i "temp/$BN-na.mp4" -i "temp/$BN-cleaned.flac" "output/$BN"; done

This was over the 255 character limit and I didn't feel like deliberately obfuscating it.

1. Create 'input', 'output' and 'temp' directories.

2. Place the files that you want to remove the hiss/static/general noise from in the input directory.

3. Generate a noise reduction profile with sox using 'sox an_input_file.mp4 -n trim x y noiseprof profile', where x and y indicates a range in seconds that only the sound you want to eliminate is present in.

4. Run the command.

Comments (2) | Add to favourites | Report as malicious | Submit alternative | Report as a duplicate

#!/bin/bash find | grep -P -v "(class)|(zip)|(png)|(gz)|(gif)|(jpeg)|(jpg)" | xargs -I @ grep -H $1 @

2011-10-14 13:28:49

User: kirdie

Functions: find grep xargs

Tags: find grep

-1

Up
Down

find&grep all in once

calls grep on all non-binary files returned by find on its current working directory

if [[ $EUID -ne 0 ]]; then echo 'Root permissions required! Exiting.'; exit; fi

2011-11-19 23:06:52

User: lordtoran

Functions: echo

Tags: root permissions authentication

-1

Up
Down

Terminate script or shell if not launched as root

This example code is intended to be used as a root permissions check in a script. It makes use of the $EUID (effective user ID) environment variable which is fully su- and sudo-safe.

Comments (0) | Add to favourites | Report as malicious | Submit alternative | Report as a duplicate

cd /System/Library/LaunchDaemons; sudo launchctl load -w com.apple.metadata.mds.plist

2012-05-16 15:42:10

User: evandrix

Functions: cd sudo

-1

Up
Down

Spotlight Server Disabled

Comments (0) | Add to favourites | Report as malicious | Submit alternative | Report as a duplicate

for i in `cat /proc/mounts | awk '{print $2}' | grep ${CDIR} |sort -r` ; do umount $i; done

2013-05-07 23:46:27

User: mordjah

Functions: awk grep sort umount

-1

Up
Down

umount --rbind mount with submounts

set CDIR for it to work right..

Comments (0) | Add to favourites | Report as malicious | Submit alternative | Report as a duplicate

tar -cvf /path/dir.tar /path/dir* --exclude "/path/dir/name" --exclude "/path/dir/opt"

2009-12-15 09:48:41

User: sandeepverma

Functions: tar

-1

Up
Down

Tar - Compress by excluding folders

get-ipsw(){ curl -s -L http://phobos.apple.com/version | sed -rn "s|[\t ]*<string>(http://appldnld\.apple\.com\.edgesuite\.net/content\.info\.apple\.com/iPhone[0-9]?/[^/]*/$1$2_$3_[A-Z0-9a-z]*_Restore\.ipsw)</string>|\1|p" | uniq; }

2010-06-22 02:34:15

User: matthewbauer

Functions: get sed

Tags: ipod iphone ios ipsw

-1

Up
Down

Get iPhone OS firmware URL (.ipsw)

Usage:

get-ipsw device-name generation-string firmware-version

For example:

get-ipsw iPod 2,1 4.0

Different generation strings:

iPhone 3G: iPhone 1,2

iPhone 3GS: iPhone 2,1

iPod touch 2G: iPod 2,1

iPod touch 3G: iPod 3,1

This can be used with idevicerestore (I haven't tried it though).

http://github.com/posixninja/idevicerestore

Based on:

http://www.tuaw.com/2010/06/21/ios-4-0-firmware-release-expected-momentarily-quick-terminal-ti/

file <filename>

2011-11-19 23:39:29

User: lordtoran

Functions: file

Tags: file files file format

-1

Up
Down

Get a file's type and metadata

Some shell newbies don't know this very handy file management related command so I decided to include it here.

You need to have the "file" package installed.

ls | xargs -I{} du -sh {}

2013-07-28 04:18:25

User: kenshin54

Functions: du ls xargs

-1

Up
Down

list each file/directory size in a directory

Comments (1) | Add to favourites | Report as malicious | Submit alternative | Report as a duplicate

<CTRL+Z>; fg

2014-04-06 14:21:08

User: kbrotheridge

-1

Up
Down

Push current task to background (paused) and resume it.

Saves opening another console terminal (eg. CTRL+ALT+F[n]) or opening another remote terminal.

Ctrl+Z pauses the current task and pushed it to the background, leaving you with a command prompt for those "Oh crap I forgot to change xyz before I ran that and it'll take forever if I Ctrl+C and start again..." situations. Typing 'fg' (shorthand for foreground, that's how I remember it) will resume the paused task.

if [ "$(ping -q -c1 google.com)" ];then wget -mnd -q http://www.google.com/intl/en_ALL/images/logo.gif ;fi

2010-03-23 04:15:03

User: alf

Functions: wget

Tags: bash Linux ping wget if

-1

Up
Down

Use ping to test if a server is up

Bash scrip to test if a server is up, you can use this before wget'ing a file to make sure a blank one isn't downloaded.

Comments (88) | Add to favourites | Report as malicious | Submit alternative | Report as a duplicate

for i in *.wma; do mplayer -vo null -vc dummy -af resample=44100 -ao pcm:waveheader:file="${i%.wma}.wav" "$i" ; done

2011-01-18 14:41:17

User: schef

-1

Up
Down

Convert wma to wav

Comments (1) | Add to favourites | Report as malicious | Submit alternative | Report as a duplicate

echo $(( $( date +%s ) - $( stat -c %Y * | sort -nr | head -n 1 ) ))

2011-05-12 14:29:45

User: depesz

Functions: date echo head sort stat

Tags: bash awk stat mtime

-1

Up
Down

Show seconds since modified of newest modified file in directory

Comments (1) | Add to favourites | Report as malicious | Submit alternative | Report as a duplicate

alias oports="echo -e "User:\tCommand:\tPort:\n----------------------------" && lsof -i 4 -P -n | awk '/LISTEN/ {print $3, $1, $9}' | sed 's/ [a-z0-9\.\*]*:/ /' | sort -u -k 3 -n | xargs printf '%-10s %-10s %-10s\n'"

2011-08-04 16:39:04

User: rthemocap

Functions: alias

-1

Up
Down

lsof - cleaned up for just open listening ports, the process, and the owner of the process

Comments (7) | Add to favourites | Report as malicious | Submit alternative | Report as a duplicate

mp4box -info video.mp4

2013-01-18 14:43:29

User: alienresident

Tags: ffmpeg

-1

Up
Down

Get video information with ffmpeg

mp4box is great when working with mp4s

Comments (0) | Add to favourites | Report as malicious | Submit alternative | Report as a duplicate

watch -n <seconds> <command>

2009-09-04 15:19:42

User: aonick

Functions: watch

Tags: bash

-1

Up
Down

bash function to check for something every 5 seconds

Every seconds do

wget http://somesite.com/somestream.pls; cvlc somestream.pls&sleep 5; rm somestream.pls*

2011-08-04 19:24:18

User: tomjrace

Functions: rm wget

-1

Up
Down

Play a stream and give back the shell

I wanted to play a song from the shell and get the shell back, I also dont want to store the file if it is not needed.

edit, not sure if I need to mention it... killall vlc to stop it

‹ First < 395 396 397 398 399 > Last ›