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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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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.




All commands from sorted by
Terminal - All commands - 11,494 results
rsync --partial --progress --rsh=ssh SOURCE DESTINATION
2009-02-16 16:22:10
User: episodeiv
Functions: rsync

Put it into your sh startup script (I use

alias scpresume='rsync --partial --progress --rsh=ssh'

in bash). When a file transfer via scp has aborted, just use scpresume instead of scp and rsync will copy only the parts of the file that haven't yet been transmitted.

getent [group|hosts|networks|passwd|protocols|services] [keyword]
2009-02-16 15:57:26
User: raphink
Functions: getent

getent allows to get the contents of several databases in their native file format even if they are not actually in /etc. For example, if you are using a LDAP or a DB to authenticate your users, you won't find their info by catting /etc/passwd, but "getent passwd" will concatenate /etc/passwd to the LDAP/DB.

netstat -ntu | awk '{print $5}' | cut -d: -f1 | sort | uniq -c | sort -n | tail
2009-02-16 15:48:27
User: TuxOtaku
Functions: awk cut netstat sort uniq

This command does a tally of concurrent active connections from single IPs and prints out those IPs that have the most active concurrent connections. VERY useful in determining the source of a DoS or DDoS attack.

du --max-depth=1 -m
cal [[month] year]
ruby -ropen-uri -e 'require "hpricot";(Hpricot(open("http://commandlinefu.com"))/".command").each{|c| puts c.to_plain_text}'
2009-02-16 15:32:58

Uses the fabulous Hpricot library to parse HTML from Ruby. Extracts all elements of "command' class and displays unescaped text from inside these elements. The following command can help install dependencies (apart from Ruby itself)

gem sources -a http://gems.github.com && sudo gem install why-hpricot
man -k <keyword>
2009-02-16 15:28:57
User: raphink
Functions: man

Search manpages for a keyword. Very useful when you don't know where to find the information.

kdialog --passivepopup <text> <timeout>
2009-02-16 15:09:27
User: raphink
Tags: KDE

Display a passive popup during seconds. Additionnaly, --title can be used to set the title of the popup. This is a nice way to communicate with a desktop user of a machine you have an SSH access on :

DISPLAY=:0 sudo -u $user -H kdialog --passivepopup "Hello you" 10 --title "cli IM"

sed -i '10d' <somefile>
2009-02-16 15:05:29
User: raphink
Functions: sed

Very useful when the ssh key of a host has changed and ssh refuses to connect to the machine, while giving you the line number that has changed in ~/.ssh/known_hosts.

LC_ALL=C svn info | grep Revision | awk '{print $2}'
2009-02-16 14:53:52
Functions: awk grep info

This is the simple revision number on stdout, that can be fed to any useful/fun script of yours. Setting LC_ALL is useful if you use another locale, in which case "Revision" is translated and cannot be found. I use this with doxygen to insert my source files revisions into the doc. An example in Doxyfile:

FILE_VERSION_FILTER = "function svn_filter { LC_ALL=C svn info $1 | grep Revision | awk '{print $2}'; }; svn_filter"

Share your ideas about what to do with the revision number !

echo "Set Twitter Status" ; read STATUS; curl -u user:pass -d status="$STATUS" http://twitter.com/statuses/update.xml
2009-02-16 14:34:05
User: ronz0
Functions: echo read

Modify the script for your username and password, and save it as a script. Run the script, and enjoy ./tweet

find . -type f -name "*" -mtime +10 -print -exec gzip {} \;
2009-02-16 14:33:32
User: migueldiab
Functions: find gzip

Useful for a cron job that runs nightly, gzipping or alternatively deleting files from a specific directory that are older than 10 days (in this case)

ps -eo pcpu,pid,args | sort -n
2009-02-16 14:23:03
Functions: ps sort

Useful to detect which process is causing system loads. It shows process PID so as we can take further actions.

du -ks * | sort -n
2009-02-16 14:18:52
Functions: du sort

Very useful for finding the largest files and subdirectories at any given point. Any user can run it from current location just when need to know their largest files and subtdirectories from a certain point down as well.

cat /dev/urandom | gzip -9 > /dev/null &
2009-02-16 14:12:38
Functions: cat gzip

check your load with top... Start more of these jobs to get an multi-core cpu busy...

identify -format "%wx%h" /path/to/image.jpg
iptables -L -n --line-numbers | grep xx.xx.xx.xx
2009-02-16 13:38:05
User: nullrouter
Functions: grep iptables

This is just one method of checking to see if an IP is blocked via IP tables or CSF. Simple and to the point. Replace xx.xx.xx.xx with the IP you wish to check.

acpi | cut -d '%' -f1 | cut -d ',' -f2
iptables -F
find / -type f -size +25M -exec ls -lh {} \; | awk '{ print $5 " " $6$7 ": " $9 }'
2009-02-16 12:27:48
User: darkon1365
Functions: awk find ls

Very useful for finding all files over a specified size, such as out of control log files chewing up all available disk space. Fedora Core x specific version.

dd if=/dev/zero of=/dev/null bs=1M count=32768
2009-02-16 12:22:18
Functions: dd

Read 32GB zero's and throw them away.

How fast is your system?

ssh-copy-id username@hostname
ps aux | awk '{sum+=$6} END {print sum/1024}'
cat ~/.ssh/*.pub | ssh user@remote-system 'umask 077; cat >>.ssh/authorized_keys'