Hide

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.
Hide

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:

Hide

News

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!
Hide

Top Tags

Hide

Functions

Hide

Credits

Commands tagged multicore from sorted by
Terminal - Commands tagged multicore - 3 results
pv file | gzip > file.gz
xargs -P 3 -n 1 <COMMAND> < <FILE_LIST>
2011-07-25 22:53:32
User: h3xx
Functions: xargs
1

For instance:

find . -type f -name '*.wav' -print0 |xargs -0 -P 3 -n 1 flac -V8

will encode all .wav files into FLAC in parallel.

Explanation of xargs flags:

-P [max-procs]: Max number of invocations to run at once. Set to 0 to run all at once [potentially dangerous re: excessive RAM usage].

-n [max-args]: Max number of arguments from the list to send to each invocation.

-0: Stdin is a null-terminated list.

I use xargs to build parallel-processing frameworks into my scripts like the one here: http://pastebin.com/1GvcifYa

taskset -c 0 your_command
2009-02-28 22:38:02
User: Alanceil
Functions: taskset
20

This is useful if you have a program which doesn't work well with multicore CPUs. With taskset you can set its CPU affinity to run on only one core.