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

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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!

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

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Maintained by Jon H.

» [email protected]

Site originally by David Winterbottom (user root).

Psst. Open beta.

Wow, didn't really expect you to read this far down. The latest iteration of the site is in open beta. It's a gentle open beta-- not in prime-time just yet. It's being hosted over at UpGuard (link) and you are more than welcome to give it a shot. Couple things:

» The open beta is running a copy of the database that will not carry over to the final version. Don't post anything you don't mind losing.
» If you wish to use your user account, you will probably need to reset your password.

Your feedback is appreciated via the form on the beta page. Thanks! -Jon & CLFU Team

Terminal - All commands - 12,362 results

randpw(){ < /dev/urandom tr -dc _A-Z-a-z-0-9 | head -c${1:-16};echo;}

2009-08-07 07:30:57

User: frozenfire

Functions: head tr

Tags: password random

Up
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Generate random password

Generates password consisting of alphanumeric characters, defaults to 16 characters unless argument given.

ab -n 9000 -c 900 localhost:8080/index.php

2009-08-07 07:19:40

User: amaymon

Tags: apache benchmark

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benchmark web server with apache benchmarking tool

-n 9000 : Number of requests to perform for the benchmarking session

-c 900 : Number of multiple requests to perform at a time

cd `dirname $_`

2009-08-07 07:08:31

User: amaymon

Functions: cd

Tags: bash bash tricks

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Go to parent directory of filename edited in last command

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dd if=/dev/urandom count=200 bs=1 2>/dev/null | tr "\n" " " | sed 's/[^a-zA-Z0-9]//g' | cut -c-16

2009-08-07 06:32:55

User: amaymon

Functions: cut dd sed tr

Tags: dd sed cut tr

Up
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Generate Random Passwords

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

cd !$:h

2009-08-07 00:37:08

User: lingo

Functions: cd

Tags: bash bash tricks

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Go to parent directory of filename edited in last command

Uses the last argument of the last executed command, and gets the directory name from it.

Use $!:t for the filename alone, without the dirname.

for I in $(mysql -e 'show databases' -s --skip-column-names); do mysqldump $I | gzip > "$I.sql.gz"; done

2009-08-07 00:25:23

User: lingo

Functions: gzip

Up
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Backup all MySQL Databases to individual files

Comments (3) | Add to favourites | Report as malicious | Submit alternative | Report as a duplicate

watch -n 1 nc localhost 80 '<<EOF GET / HTTP/1.1 Host: tux-ninja Connection: Close EOF'

2009-08-06 23:20:31

User: JustinHop

Functions: watch

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Test http request every second, fancy display.

Use the command watch, which is really hard to pass nested quotes to, and insert newlines where they are supposed to go in the HTTP request. that is after 1.1 after the host and two newlines at the end before the EOF.

i use this all day

what? no support for HEREDOCs on commandlinefu's interface? need more fu.

cat files.txt | xargs tar -cv | tar -x -c $DIR/

2009-08-06 22:55:21

User: lingo

Functions: cat tar xargs

Tags: copy tar directories files list

Up
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Copy files from list with hierarchy

If you want certain files out of a directory hierarchy, this will copy just the listed files, but will create the directory hierarchy in the new location ($DIR/)

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ifconfig $devices | grep "inet addr" | sed 's/.*inet addr:$[0-9\.]*$.*/\1/g'

2009-08-06 21:43:22

User: matthewbauer

Functions: grep ifconfig sed

Tags: internal ip

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Get your internal IP address and nothing but your internal IP address

Will return your internal IP address.

rm -d **/*(/^F)

2009-08-06 21:41:19

User: claytron

Functions: rm

Tags: find zsh glob

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Delete empty directories with zsh

This command uses the recursive glob and glob qualifiers from zsh. This will remove all the empty directories from the current directory down.

The **/* recurses down through all the files and directories

The glob qualifiers are added into the parenthesis. The / means only directories. The F means 'full' directories, and the ^ reverses that to mean non-full directories. For more info on these qualifiers see the zsh docs: http://zsh.dotsrc.org/Doc/Release/Expansion.html#SEC87

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find . -name "-help" -exec mv {} help.txt \;

2009-08-06 20:43:30

User: petrohs

Functions: find mv

Tags: mv find;

-7

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renombrar un archivo que inicia con guion

sudo snmptrap -m ALL -v 2c -c public trapserver "" UCD-DEMO-MIB::ucdDemoPublic SNMPv2-MIB::sysLocation.0 s "Just here"

2009-08-06 17:32:16

User: vutcovici

Functions: sudo

Up
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Send SNMP traps

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cp path/filename{,-$(date +%Y-%m-%d)}

2009-08-06 13:50:00

User: vutcovici

Functions: cp date

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Create a backup of the file.

It will create a backup of the filename. The advantage is that if you list the folder the backups will be sorted by date. The command works on any unix in bash.

wget -O - http://checkip.dyndns.org|sed 's/[^0-9.]//g'

2009-08-06 12:47:32

User: thundernode

Functions: sed wget

-1

Up
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Get your external IP address

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fetch -q -o - http://ipchicken.com | egrep -o '([[:digit:]]{1,3}\.){3}[[:digit:]]{1,3}'

2009-08-06 11:57:44

User: spackle

Functions: egrep

Tags: Network grep regex fetch

-1

Up
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Get your external IP address

Same thing as above, just uses fetch and ipchicken.com

nmap -PN -d -p445 --script=smb-check-vulns --script-args=safe=1 IP-RANGES

2009-08-06 11:54:33

User: themoux

Up
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Conficker Detection with NMAP

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curl -s 'http://checkip.dyndns.org' | sed 's/.*Current IP Address: $[0-9\.]*$.*/\1/g'

2009-08-06 11:54:31

User: kulor

Functions: sed

Tags: Network sed curl

Up
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Get your external IP address

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html2text http://checkip.dyndns.org | grep -i 'Current IP Address:'|cut -d' ' -f4

2009-08-06 11:30:32

User: adonis28850

Functions: cut grep

-2

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Get your external IP address

The same as the other user, but smarter, using -d and -f

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ulimit -s 64

2009-08-06 10:40:25

User: ioggstream

Functions: ulimit

Tags: Linux ulimit

Up
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Create more threads with less stack space

default stack size is 10M. This makes your multithread app filling rapidly your memory.

on my PC I was able to create only 300thread with default stack size.

Lower the default stack size to the one effectively used by your threads, let you create more.

ex. putting 64k I was able to create more than 10.000threads.

Obviously ...your thread shouldn't need more than 64k ram!!!

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ldapmodify -Y "dn:uid=rob,dc=example.com" -g -R -J 2.16.840.1.113730.3.4.16 ...

2009-08-06 10:33:05

User: ioggstream

Tags: ldapsearch mozldap

Up
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modify (mozldap) with proxy authentication and no other controls

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html2text http://checkip.dyndns.org | grep -i 'Current IP Address:'|cut -c21-36

2009-08-06 10:29:02

User: tkoopa

Functions: cut grep

-1

Up
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Get your external IP address

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

curl -u yourusername:yourpassword -d status=?Your Message Here? https://twitter.com/statuses/update.xml

2009-08-06 09:31:53

User: terminalhacker

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Tweet from Terminal to twitter !

Tweeting from terminal to twitter accounts..

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schedtool 1

2009-08-06 08:42:03

User: terminalhacker

-1

Up
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command to display info about the core specified

Display information about the cores.

* sudo apt-get install schedtool

mencoder "mf://frame_*.bmp" -mf w=720:h=480:fps=30:type=bmp -ovc lavc -lavcopts vcodec=mpeg4 -o number_video.mp4

2009-08-06 06:59:49

User: terminalhacker

Up
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Convert a batch of images to a Video

Converts the batch of images to video.

*mencoder* required.

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

pidstat -C "ffmpeg" -u

2009-08-06 06:56:01

User: terminalhacker

Up
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Command to display how much resource is taken by cpu and which core is taking

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