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.

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:



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





Commands by kniht from sorted by
Terminal - Commands by kniht - 5 results
echo 'some command' | batch
2010-07-14 03:08:31
User: kniht
Functions: echo

If shell escaping of the command is problematic, you can write the command to a file first:

batch <somefile

Or read it:

read -re && echo "$REPLY" | batch

Or, if your shell supports it, you can eliminate echo:

read -re && batch <<<$REPLY

("man batch" lists 1.5 for me, but I don't know how widely it differs.)

sed -n '4{p;q}'
find . -iname '*.jpg' | sed 's/.*/<img src="&">/' > gallery.html
2010-07-04 00:50:32
User: kniht
Functions: find sed

My take on the original: even though I like the other's use of -exec echo, sed just feels more natural. This should also be slightly easier to improve.

I expanded this into a script as an exercise, which took about 35 minutes (had to look up some docs): http://bitbucket.org/kniht/nonsense/src/7c1b46488dfc/commandlinefu/quick_image_gallery.py

ip addr show eth0 | awk '/inet / {FS = "/"; $0 = $2; print $1}'
2010-06-30 14:33:48
User: kniht
Functions: awk

Combines wgzhao's grep | awk | sed into one awk command.

function countdown { case "$1" in -s) shift;; *) set $(($1 * 60));; esac; local S=" "; for i in $(seq "$1" -1 1); do echo -ne "$S\r $i\r"; sleep 1; done; echo -e "$S\rBOOM!"; }
2010-06-30 12:20:01
User: kniht
Functions: echo seq set sleep
Tags: timer counter

The biggest advantage over atoponce's nifty original is not killing the scrollback. Written assuming bash, but shouldn't be terribly difficult to port to other shells. S should be multiple spaces, but I can't get commandlinefu to save/show them properly, any help?