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.


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:



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.




Commands using ssh from sorted by
Terminal - Commands using ssh - 294 results
dd if=/dev/zero bs=1M | ssh somesite dd of=/dev/null
while [ ! -f /tmp/stop ]; do ssh -o ExitOnForwardFailure=yes -R 2222:localhost:22 target "while nc -zv localhost 2222; do sleep 5; done"; sleep 5;done
diff <(ssh nx915000 "rpm -qa") <(ssh nx915001 "rpm -qa")
echo -n m{1..5}.cluster.net | xargs -d' ' -n1 -P5 -I{} ssh {} 'uptime'
dd if=/dev/dsp | ssh -c arcfour -C username@host dd of=/dev/dsp
2009-02-08 10:10:00
User: morpheus
Functions: dd ssh

This will output the sound from your microphone port to the ssh target computer's speaker port. The sound quality is very bad, so you will hear a lot of hissing.

tar -cvzf - /source/path | ssh <targethostname> -l <username> dd of=/destination/path/backupfile.tgz
2009-02-06 15:52:09
User: smm
Functions: dd ssh tar

Creates a quick backup with tar to a remote host over ssh.

ssh -N -L2001:localhost:80 -o "ProxyCommand ssh someuser@hubmachine nc -w 5 %h %p" someuser@destinationmachine
2009-02-06 09:58:08
Functions: ssh

this is handy when the hubmachine is the only machine that can connect to the destination machine (allowed on ip by firewall) and you want to access it from your laptop.

cat ~/.ssh/id_rsa.pub | ssh user@machine "mkdir ~/.ssh; cat >> ~/.ssh/authorized_keys"
2009-02-05 19:37:56
User: DEinspanjer
Functions: cat ssh

If you use Mac OS X or some other *nix variant that doesn't come with ssh-copy-id, this one-liner will allow you to add your public key to a remote machine so you can subsequently ssh to that machine without a password.

ssh-keygen -l -f [pubkey] | awk '{print $2}' | tr -ds ':' '' | egrep -ie "[a-f0-9]{32}"
ssh-keygen -i -f $sshkeysfile >> authorized_keys
dump 0f - / | bzip -c9 | ssh user@host "cat > /home/user/root.dump.bz2"
2009-02-05 17:22:32
User: wwest4
Functions: dump ssh

...can do similar w/ tar, dd, xfsdump, e2fsdump, etc.

vimdiff tera.py <(ssh -A testserver "cat tera.py")
ssh-keygen -R \[localhost\]:8022
2009-02-05 11:48:09
User: Sekenre
Functions: ssh ssh-keygen

Useful if you have to tunnel ssh through a local port and it complains of the host key being different. Much easier than manually editing the file.

ping localip -c 1 -W 1 &> /dev/null && ssh localip || ssh globalip
2009-02-05 10:40:26
User: trey
Functions: ping ssh

Ping machine once, waiting 1 second for response until failing. Upon fail, ssh globally, otherwise ssh locally.

ssh -N -L2001:localhost:80 somemachine
ssh somemachine "cd some dir; tar zcpf - somedirname" |tar zxpf -
ssh user@host cat /path/to/remotefile | diff /path/to/localfile -
2009-02-04 11:33:19
User: root
Functions: cat diff ssh

Useful for checking if there are differences between local and remote files.

tar czv file1 file2 folder1 | ssh user@server tar zxv -C /destination
2009-01-29 10:38:26
User: xsawyerx
Functions: ssh tar

it compresses the files and folders to stdout, secure copies it to the server's stdin and runs tar there to extract the input and output to whatever destination using -C. if you emit "-C /destination", it will extract it to the home folder of the user, much like `scp file user@server:`.

the "v" in the tar command can be removed for no verbosity.

ssh user@host "ps aux | grep httpd | wc -l"
2009-01-27 00:46:17
User: root
Functions: ssh

This counts the number of httpd processes running.