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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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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!

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Psst. Open beta.

Wow, didn't really expect you to read this far down. The latest iteration of the site is in open beta. It's a gentle open beta-- not in prime-time just yet. It's being hosted over at UpGuard (link) and you are more than welcome to give it a shot. Couple things:

  • » The open beta is running a copy of the database that will not carry over to the final version. Don't post anything you don't mind losing.
  • » If you wish to use your user account, you will probably need to reset your password.
Your feedback is appreciated via the form on the beta page. Thanks! -Jon & CLFU Team

Commands tagged parallel from sorted by
Terminal - Commands tagged parallel - 29 results
find -not -empty -type f -printf "%s\n" | sort | uniq -d | parallel find -type f -size {}c | parallel md5sum | sort | uniq -w32 --all-repeated=separate
2010-01-28 08:40:18
Functions: find md5sum sort uniq
Tags: xargs parallel

A bit shorter and parallelized. Depending on the speed of your cpu and your disk this may run faster.

Parallel is from https://savannah.nongnu.org/projects/parallel/

tar -tf <file.tar.gz> | parallel rm
2010-01-28 08:28:16
Functions: tar

xargs deals badly with special characters (such as space, ' and "). To see the problem try this:

touch important_file

touch 'not important_file'

ls not* | xargs rm

Parallel https://savannah.nongnu.org/projects/parallel/ does not have this problem.

seq 1 5 | parallel ssh {}.cluster.net uptime
2010-01-28 08:18:50
Functions: seq ssh
Tags: parallel

Parallel is from https://savannah.nongnu.org/projects/parallel/

Other examples would be:

(echo foss.org.my; echo www.debian.org; echo www.freenetproject.org) | parallel traceroute

seq -f %04g 0 9999 | parallel -X rm pict{}.jpg

find . -type f -print0 | xargs -0 -P 4 -n 40 grep -i foobar
2009-08-05 23:18:44
User: ketil
Functions: find grep xargs

xargs -P N spawns up to N worker processes. -n 40 means each grep command gets up to 40 file names each on the command line.