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.

OpenID
or
Sign in Register

First-time OpenID users will be automatically assigned a username which can be changed after signing in.

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

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.
Hide

Tags

Hide

Functions

Hide

Credits

Site by David Winterbottom (user root).

prints line numbers

Terminal - prints line numbers
nl
2009-12-08 19:30:32
User: solarislackware
Functions: nl
26
Up
Down
prints line numbers
Show sample output | Add to favourites | Report as malicious

Alternatives

There is 1 alternative - vote for the best!

Terminal - Alternatives
cat -n
2009-12-08 16:35:55
User: putnamhill
Functions: cat
Tags: cat
4
Up
Down
prints line numbers
Comments (2) | Add to favourites | Report as malicious
ls | sed "/^/=" | sed "N;s/\n/. /"
2010-01-06 16:00:39
User: glaudiston
Functions: ls sed
2
Up
Down
prints line numbers

the sed way to print line numbers

Show sample output | Comments (0) | Add to favourites | Report as malicious
grep -n "^" <filename>
2010-01-07 14:54:29
User: JohnGH
Functions: grep
2
Up
Down
Prints line numbers

If you don't have nl on your system, this achieves a similar effect, the default behavior in nl is to not number blank lines, but this does.

Comments (0) | Add to favourites | Report as malicious
perl -pe 'print "$. "' <file>
2009-12-08 16:11:51
User: sputnick
Functions: perl
0
Up
Down
prints line numbers

No need $_ netp ;)

Comments (7) | Add to favourites | Report as malicious
perl -e 'use strict; use warnings; my $c; my $file = $ARGV[0]; open my $handle, "<", $file or die "$0: $file: $!\n"; while (<$handle>) { print $c++, " " x 5, $_; } close($handle);' <FILE>
2009-12-09 16:07:14
User: sputnick
Functions: perl
0
Up
Down
Joke : prints line numbers in a longest way

This is a joke for @putnamhill and @glaudiston

I'm pretty sure we can write longer if we want ;)

Comments (2) | Add to favourites | Report as malicious

Know a better way?

If you can do better, submit your command here.

What others think

sed '='

Comment by KevinM 209 weeks ago

fwiw nl has lots of options e.g. old school fun:

nl -v10 -i10 ~/bin/helloworld

10 PRINT "hello world"

20 GOTO 10

Comment by Buzzcp 208 weeks and 5 days ago

fwiw nl has lots of options e.g. old school fun:

nl -v10 -i10 ~/bin/helloworld

10 PRINT "hello world"

20 GOTO 10

Comment by Buzzcp 208 weeks and 5 days ago

Your point of view

You must be signed in to comment.

Related sites and podcasts