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





Limit the cpu usage of a process

Terminal - Limit the cpu usage of a process
sudo cpulimit -p pid -l 50
2011-11-21 08:43:57
User: Dhinesh
Functions: sudo
Limit the cpu usage of a process

This will limit the average amount of CPU it consumes.


There is 1 alternative - vote for the best!

Terminal - Alternatives
prlimit --cpu=10 sort -u hugefile
2013-02-27 15:59:11
User: mhs
Functions: sort
Tags: cpu util-linux

Similar to `cpulimit`, although `prlimit` can be found shipped with recent util-linux.

Example: limit CPU consumption to 10% for a math problem which ordinarily takes up 100% CPU:


bc -l <(echo "1234123412341234^12341234")

See the difference `prlimit` makes:

prlimit --cpu=10 bc -l <(echo "1234123412341234^12341234")

To actually monitor the CPU usage, use `top`, `sar`, etc.. or:

pidstat -C 'bc' -hur -p ALL 1
sudo cpulimit -e Grooveshark -l 20
2010-11-15 16:58:50
User: poulter7
Functions: sudo

Will limit the amount of CPU time Grooveshark the greedy yet useful Adobe Air app will have.

Leaves the UI lagging a little, but crucially does not ruin the audio.

Know a better way?

If you can do better, submit your command here.

What others think

CentOS 5.5 doesn't have it. What package can provide it?

Comment by mente 201 weeks ago

neither on fedora 16

# yum provides '*/cpulimit'

returns nothing

Comment by The_IceMan_Blog 201 weeks ago

available on github:


Comment by piccobello 149 weeks and 6 days ago

Your point of view

You must be signed in to comment.