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.


If you have a new feature suggestion or find a bug, please get in touch via http://commandlinefu.uservoice.com/

Get involved!

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

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

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:

Hide

News

2011-03-12 - Confoo 2011 presentation
Slides are available from the commandlinefu presentation at Confoo 2011: http://presentations.codeinthehole.com/confoo2011/
2011-01-04 - Moderation now required for new commands
To try and put and end to the spamming, new commands require moderation before they will appear on the site.
2010-12-27 - Apologies for not banning the trolls sooner
Have been away from the interwebs over Christmas. Will be more vigilant henceforth.
2010-09-24 - OAuth and pagination problems fixed
Apologies for the delay in getting Twitter's OAuth supported. Annoying pagination gremlin also fixed.
Hide

Tags

Hide

Functions

Commands using cut from sorted by
Terminal - Commands using cut - 458 results
pacman -Qi | grep 'Name\|Size\|Description' | cut -d: -f2 | paste - - - | awk -F'\t' '{ print $2, "\t", $1, "\t", $3 }' | sort -rn
2012-11-20 03:40:55
Functions: awk cut grep paste sort
0

This, like the other commands listed here, displays installed arch packages. Unlike the other ones this also displays the short description so you can see what that package does without having to go to google. It also shows the largest packages on top. You can optionally pipe this through head to display an arbitrary number of the largest packages installed (e.g. ... | head -30 # for the largest 30 packages installed)

nmap -sP 192.168.1.0/24 | grep "Nmap scan report for"| cut -d' ' -f 5 > ips.txt
vim $(grep [REGULAR_EXPRESSION] -R * | cut -d":" -f1 | uniq)
tail -f /var/log/messages.log | while read line ; do echo $line | cut -d \ -f5- | sed s/\\[[0-9]*\\]// | espeak ; done
dpkg --list | rgrep ii | cut -d" " -f3 | sed ':a;N;$!ba;s/\n/ /g' | sed 's/^\(.\)/apt-get install \1/'
curl -s mi-ip.net | grep '"ip"' | cut -f2 -d ">" | egrep -o '[0-9.]+'
2012-10-15 16:48:20
User: dragonauta
Functions: cut egrep grep
0

looks at html for "ip" (it's a CSS class), then a little of cut and egrep to get IPv4 address.

I use this oneliner into conky.

find . \( -iname '*.cpp' -o -iname '*.h' \) -exec wc -l {} \; | sort -n | cut --delimiter=. -f 1 | awk '{s+=$1} END {print s}'
2012-09-19 15:21:01
User: jecxjoopenid
Functions: awk cut find sort wc
0

Searches for *.cpp and *.h in directory structure, counts the number of lines for each matching file and adds the counts together.

lpstat -p | cut -d' ' -f2 | xargs -I{} lpadmin -x {}
2012-09-18 02:11:53
User: bmeehan
Functions: cut lpadmin lpstat xargs
0

This is the closest you can get to "reset printing system" from the command line. Giving credit back to J D McIninch from an apple forum back in 2009.

echo $(find <directory> -name '*.<extension>' -exec du -s {} \; | tee $(tty) | cut -f1 | tr '\n' '+') 0 | bc
2012-09-17 22:46:50
User: ysangkok
Functions: cut du echo find tee tr
-1

Also shows files as they are found. Only works from a tty.

getent passwd | cut -d: -f1 | sort
lynx -useragent=Opera -dump 'http://www.facebook.com/ajax/typeahead_friends.php?u=521826202&__a=1' |gawk -F'\"t\":\"' -v RS='\",' 'RT{print $NF}' |grep -v '\"n\":\"' |cut -d, -f2
lynx -useragent=Opera -dump 'http://www.facebook.com/ajax/typeahead_friends.php?u=4&__a=1' |gawk -F'\"t\":\"' -v RS='\",' 'RT{print $NF}' |grep -v '\"n\":\"' |cut -d, -f2
lynx -useragent=Opera -dump 'http://www.facebook.com/ajax/typeahead_friends.php?u=100000475200812&__a=1' |gawk -F'\"t\":\"' -v RS='\",' 'RT{print $NF}' |grep -v '\"n\":\"' |cut -d, -f2
cut -c23-37 /var/log/squid3/access.log | cut -d' ' -f1 | sort | uniq
2012-09-07 14:57:26
User: dan
Functions: cut sort
Tags: squid webproxy
3

Generates the list of clients (IPs addresses) that have used the Squid webproxy according to the most recent log. Every IP appears only once in the list.

lsmod | tail -n +2 | cut -d' ' -f1 | xargs modinfo | egrep '^file|^desc|^dep' | sed -e'/^dep/s/$/\n/g'
asterisk -rx "core show calls" | grep "active" | cut -d' ' -f1
buf () { oldname=$1; if [ "$oldname" != "" ]; then datepart="$(date +%Y-%m-%d).bak"; firstpart=`echo $oldname | cut -d "." -f 1`; newname=`echo $oldname | sed s/$firstpart/$firstpart.$datepart/`; cp -iv ${oldname} ${newname}; fi }
2012-08-15 08:31:44
User: juliushibert
Functions: cp cut sed
1

Appends the input file with the date format YYYY-MM-DD.bak. Also runs silently if you remove the -v on the cp at the end of the function.

nmap -n -sP -oG - 10.10.10.*/32 | grep ": Up" | cut -d' ' -f2
2012-08-13 15:37:21
Functions: cut grep
0

You can substitute 10.10.10.* by your own network. Or whatever nmap accepts, inlcluding submask.

ssh-keygen -l -f [pubkey] | cut -d ' ' -f 2 | tr -ds '\n:' ''
eselect bashcomp enable --global $(eselect bashcomp list | sed -e 's/ //g'| cut -d']' -f2 | sed -e 's/\*//'| xargs)
curl -s http://checkrealip.com/ | grep "Current IP Address" | cut -d ' ' -f 4
ip a s eth0 | grep "inet " | head -n 1 | awk '{print $2}' | cut -f1 -d'/'
2012-07-16 07:54:43
User: thelan
Functions: awk cut grep head
Tags: IP
-4

Get the first IPv4 address of an interface

ifconfig | grep "inet addr" | cut -d":" -f2 | cut -d" " -f1
for user in $(getent passwd|cut -f1 -d:); do echo "### Crontabs for $user ####"; crontab -u $user -l; done
2012-07-11 13:06:17
User: harpo
Functions: crontab cut echo getent
Tags: crontab getent
0

added echo "### Crontabs for $user ####"; to make clear whose crontab is listed.

for user in $(cut -f1 -d: /etc/passwd); do echo "### Crontabs for $user ####"; crontab -u $user -l; done
2012-07-11 12:25:56
User: harpo
Functions: crontab cut echo
Tags: crontab
3

added echo "### Crontabs for $user ####"; to make clear whose crontab is listed.