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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!

Top Tags



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

All commands from sorted by
Terminal - All commands - 12,392 results
awk 'BEGIN {FS=","} { print $1 " " $2 " " $NF}' foo.txt
2010-11-12 15:26:04
User: EBAH
Functions: awk

Set field separator char from command line.

Prints first, second and lsat columns.

fdupes -r -1 path | while read line; do j="0"; for file in ${line[*]}; do if [ "$j" == "0" ]; then j="1"; else sudo ln -f ${line// .*/} $file; fi; done; done
scalac quicksort.scala && javap QuickSort
dd if=/dev/zero of=test bs=1024k count=1024 & bash -c "while :; do clear;echo STATS FOR DD:;kill -USR1 $!; sleep 1; done"
2011-08-19 01:10:18
User: ideivid
Functions: bash dd

Have you ever wondered what the hell was dd command doing? well, there you have it... notice the -USR1 signal :)...

rm -rf / & disown $!
2014-02-13 05:15:25
User: caddymob
Functions: rm
Tags: root dont cant

sudo when you mean it

ps aux | grep $USER


alias mine='ps xco pid,command,%cpu,%mem,state'
alias nl2space="perl -ne 'push @F, \$_; END { chomp @F; print join(qq{ }, @F) , qq{\n};}' "
2009-10-01 02:22:23
User: relay
Functions: alias

# newline to space; the whack before dollar-underbar is required

alias nl2space="perl -ne 'push @F, \$_; END { chomp @F; print join(qq{ }, @F) , qq{\n};}' "

# newline to comma; the whack before dollar-underbar is required

alias nl2,="perl -ne 'push @F, \$_; END { chomp @F; print join(qq{,}, @F) , qq{\n};}' "

PROMPT> cat /tmp/foo











# 'tr' does not give a newline after it run. Makes a messy commandline.

PROMPT> cat /tmp/foo|tr "\n" ' '

foo-001 foo-002 foo-003 foo-004 foo-005 foo-006 foo-007 foo-008 foo-009 foo-010 $PROMPT> tr "\n" ' ' /tmp/foo

# 'tr' does not take arguements

PROMPT> tr "\n" ' ' /tmp/foo

tr: extra operand `/tmp/foo'

Try `tr --help' for more information.

# 'nl2space' is a filter and takes arguements, adds a newline after it runs.

PROMPT> cat /tmp/foo| nl2space

foo-001 foo-002 foo-003 foo-004 foo-005 foo-006 foo-007 foo-008 foo-009 foo-010

PROMPT> nl2space /tmp/foo

foo-001 foo-002 foo-003 foo-004 foo-005 foo-006 foo-007 foo-008 foo-009 foo-010

ls -t1 | sed 1d | parallel -X rm
2010-01-28 12:28:18
Functions: ls sed

xargs deals badly with special characters (such as space, ' and "). To see the problem try this:

touch important_file

touch 'not important_file'

ls not* | xargs rm

Parallel https://savannah.nongnu.org/projects/parallel/ does not have this problem.

ls -lart
2011-05-28 15:01:39
User: shardservant
Functions: ls

-l for long list, -r for recursive, -a for display of hidden files, and -t for modification date

lspci | grep -i pci
rm -rf / --no-preserve-root & disown $! && exit
2014-02-13 06:00:25
User: caddymob
Functions: rm
Tags: sudo root rm

do it, disown it and exit without time for a mess

sudo when you mean it

ps aux | grep $USER


ruby -e 'require "date"; puts DateTime.now.cweek'
find . -exec grep $foo {} \; -print
2009-12-30 17:41:44
User: linuxgeek
Functions: find grep

The command will help to print the location of the pattern. Above command will print all the files which contain variable "$foo" along with line containing that pattern.

Specify pattern after "grep"

yt-chanrip() { for i in $(curl -s http://gdata.youtube.com/feeds/api/users/"$1"/uploads | grep -Eo "watch\?v=[^[:space:]\"\'\\]{11}" | uniq); do youtube-dl --title --no-overwrites http://youtube.com/"$i"; done }
ans=$(zenity --title "Choose image:" --file-selection); exiftool -s ${ans} | zenity --width 800 --height 600 --text-info;
du -sch *
2011-12-06 18:38:20
User: anarcat
Functions: du
Tags: space du disk

All folders, human-readable, no subfolder, with a total. Even shorter.

find ./ -maxdepth 1 -empty -type d -delete
echo "javascript:location.href='http://www.commandlinefu.com/commands/matching/'+encodeURIComponent('%s')+'/'+btoa('%s')+'/sort-by-votes'"
2011-03-07 22:01:46
User: darkfader
Functions: echo

If you add the bookmarklet to your browser's bookmarks with like say, the keyword 'cfu', you can for example type 'cfu hello' in the location bar and the %s gets replaced with 'hello'.

The bookmarklet will convert the search text to base64 for use with the commandlinefu website and will take you there. Tested with Firefox.

awk ' { printf ("%s ", $0)} END {printf ("\n") } ' FILE
2011-02-02 11:51:41
User: bouktin
Functions: awk printf
Tags: awk

remove all carriage return of a given file (or input, if used with | ) and replace them with a space (or whatever character is after %s)

while true; do date; ssh <YOUR HOST HERE> "echo" && echo "HOST UP" && break; sleep 60; done
cat .ssh/id_dsa.pub | ssh <HOST> "mkdir -p .ssh && tee -a .ssh/authorized_keys"
mysql -u uname dbname -e "show tables" | grep -v Tables_in | grep -v "+" | gawk '{print "drop table " $1 ";"}' | mysql -u uname dbname
echo 2006-10-10 | grep -c '^[0-9][0-9][0-9][0-9]-[0-9][0-9]-[0-9][0-9]$'
2009-05-11 22:18:43
User: rez0r
Functions: echo grep

Quick and easy way of validating a date format of yyyy-mm-dd and returning a boolean, the regex can easily be upgraded to handle "in betweens" for mm dd or to validate other types of strings, ex. ip address.

Boolean output could easily be piped into a condition for a more complete one-liner.

mail -s scream-dump [email protected] < /tmp/scream-dump
i=10;for o in *.mp3; do i=$(printf "%02d" $i); mv $o $i$o; ((i = $i + 2)); done
2009-04-13 12:33:52
User: bazzawill
Functions: mv printf

This command adds the numbers 10, 12, 14 to a bunch of mp3's in the current working directory. You can then run the command replacing the inital i=10 with i=11 to add 11,13,15 in another directory then mv the files together and the first files interweave with the second group of files. I used this to weave a backlog of a podcast with other podcast so I didn't get sick of one while I was catching up. I started at 10 because printf blows up with 0 padded numbers 08 and 09 which kind of makes the printf command redundant as it was used to pad numbers 1 - 9 so they would come first and not get sorted incorrectly