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.

Universal configuration monitoring and system of record for IT.
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

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

Hide

Functions

Hide

Credits

Commands using cut from sorted by
Terminal - Commands using cut - 485 results
svn log -q | grep -v "^-" | cut -d "|" -f 2 | sort -u
grep -i "aborted login" /var/log/maillog | awk 'BEGIN{FS="="}{print substr($4,8)}' | cut -d"," -f1
2010-09-29 21:05:31
User: cicatriz
Functions: awk cut grep
0

Prints a list of ip that tried to login on SMTP/IMAP/POP3/etc.

for net in $(ip route show | cut -f1 -d\ | grep -v default); do ipcalc $net | grep Broadcast | cut -d\ -f 2; done
2010-09-28 13:21:31
User: svg
Functions: cut grep route
0

Can be used in a firewall script, e.g. to avoid logging broadcast packtes.

echo Good $(i=`date | cut -d: -f1 | cut -d' ' -f4-4` ; if [ $i -lt 12 ] ; then echo morning ; else if [ $i -lt 15 ] ; then echo afternoon ; else echo evening ; fi ; fi)
2010-09-21 11:16:36
User: foolcraft
Functions: cut echo
0

Get the hour and greet the user!

Make sure you add this to your bashrc, for a pleasant hacking experience!

for x in $(eselect bashcomp list | sed -e 's/ //g' | cut -d']' -f2 | sed -e 's/\*//');do eselect bashcomp enable $x --global;sleep 0.5s;done
2010-09-21 00:17:26
User: chronos
Functions: cut enable sed sleep
4

enable each bash completion that you have installed at your system, that's very nice ;)

ls *.JPG | cut -d . -f 1 | xargs -L1 -i convert -resize 684 {}.JPG {}.jpg
svn log 2>&1 | egrep '^r[0-9]+' | cut -d "|" -f2 | sort | uniq -c
wget -O- -q http://www.nomachine.com/download-package.php?Prod_Id=2067 | sed -n -e 'H;${x;s/\n/ /g;p;}' | sed -e "s/[Hh][Rr][Ee][Ff]=\"/\n/g" | cut -d "\"" -f1 | sort -u | grep deb$
wget http://forums.dropbox.com && wget $(cat index.html|grep "Latest Forum Build"|cut -d"\"" -f2) && wget $(cat topic.php*|grep "Linux x86:"|cut -d"\"" -f2|sort -r|head -n1) && rm -rf ~/.dropbox* && rm index.html *.php* && tar zxvf dropbox-*.tar.gz -C ~/
man $(ls -1 /usr/share/man/man?/ | shuf -n1 | cut -d. -f1)
2010-08-20 23:36:10
User: dooblem
Functions: cut ls man
Tags: man sort shuf
-3

Another one.

Maybe not the quicker because of the sort command, but it will also look in other man sections.

updated with goodevilgenius 'shuf' idea

getent hosts positon.org | cut -d' ' -f1
2010-08-11 09:06:39
User: dooblem
Functions: cut getent
Tags: getent
1

I just wanted a simple DNS request.

Because host and nslookup commands are not on all systems, we use getent instead.

Thanks aulem for that tip.

netstat -rn | grep UG | tr -s " " | cut -d" " -f2
TTY=$(tty | cut -c 6-);who | grep "$TTY " | awk '{print $6}' | tr -d '()'
git log --format='%aN <%aE>' | awk '{arr[$0]++} END{for (i in arr){print arr[i], i;}}' | sort -rn | cut -d\ -f2-
2010-07-19 11:40:52
Functions: awk cut sort
Tags: git
3

Gets the authors, sorts by number of commits (as a vague way of estimating how much of the project is their work, i.e. the higher in the list, the more they've done) and then outputs the results.

grep -i '^DocumentRoot' /etc/httpd/conf/httpd.conf | cut -f2 -d'"'
objdump -d ./PROGRAM|grep '[0-9a-f]:'|grep -v 'file'|cut -f2 -d:|cut -f1-6 -d' '|tr -s ' '|tr '\t' ' '|sed 's/ $//g'|sed 's/ /\\x/g'|paste -d '' -s |sed 's/^/"/'|sed 's/$/"/g'
cut -f 1 three-column.txt > first-column.txt
2010-07-11 10:13:45
User: postrational
Functions: cut
4

There is a common command for outputting a field or list of fields from each line in a file. Why wouldn't you just use cut?

ps -axgu | cut -f1 -d' ' | sort -u
cut -d: -f1 /etc/passwd | sort
sudo lsof|sed 's/ */ /g'|cut -f3 -d' '|sort -u
2010-07-07 08:20:28
User: binaryten
Functions: cut sed sort sudo
-4

Most systems (at least my macbook) have system users defined, such as _www and using "users" for example will not list them. This command allows you to see who the 'virtual' users are on your system.

ifconfig eth0 | grep -o "inet [^ ]*" | cut -d: -f2
ifconfig eth0 | awk '/inet / {print $2}' | cut -d ':' -f2
ifconfig eth0 | grep "inet " | cut -d ':' -f2 | awk '{print $1}'
2010-06-29 00:06:08
User: jaimerosario
Functions: awk cut grep ifconfig
3

I've been using it in a script to build from scratch proxy servers.

ifconfig eth0 | grep 'inet addr' | cut -d ':' -f 2 | cut -d ' ' -f 1
2010-06-26 22:36:21
User: atoponce
Functions: cut grep ifconfig
Tags: ifconfig
2

Simple and easy. No regex, no search and replace. Just clean, built-in tools.

dhclient wlan0 && sbnt=$(ifconfig wlan0 |grep "inet addr" |cut -d ":" -f 2 | cut -d "." -f 1-3) && nmap $sbnt.0/24 -sP
2010-06-22 21:00:29
User: wltj
Functions: cut grep ifconfig
-1

This is helpful if you connect to several networks with different subnets such as 192 networks, 10 networks, etc. Cuts first three octets of ip from ifconfig command and runs nmap ping scan on that subnet.

Replace wlan0 with your interface. Assumes class c network, if class b use: cut -d "." -f 1-2 and change nmap command accordingly.