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).

Match a URL

Terminal - Match a URL
egrep 'https?://([[:alpha:]]([-[:alnum:]]+[[:alnum:]])*\.)+[[:alpha:]]{2,3}(:\d+)?(/([-\w/_\.]*(\?\S+)?)?)?'
2009-11-28 15:41:42
User: putnamhill
Functions: egrep
5
Up
Down
Match a URL

For the record: I didn't build this. Just shared what I found that worked. Apologies to the original author!

I decided I should fix the case where http://example.com is not matched for the next time I need this. So I read rfc1035 and formalized the host name regex.

If anyone finds any more holes, please comment.

Add to favourites | Report as malicious

Alternatives

There are 9 alternatives - vote for the best!

Terminal - Alternatives
echo "(Something like http://foo.com/blah_blah)" | grep -oP "\b(([\w-]+://?|www[.])[^\s()<>]+(?:\([\w\d]+\)|([^[:punct:]\s]|/)))"
2009-11-28 00:41:57
User: matthewbauer
Functions: echo grep
Tags: perl regex url match url matching
0
Up
Down
Match a URL

From http://daringfireball.net/2009/11/liberal_regex_for_matching_urls

Thought it would be useful to commandlinefuers.

Show sample output | Comments (0) | Add to favourites | Report as malicious
cho "(Something like http://foo.com/blah_blah)" | awk '{for(i=1;i<=NF;i++){if($i~/^(http|ftp):\/\//)print $i}}'
2009-11-28 03:31:41
User: unixmonkey7109
Functions: awk
Tags: perl regex url match url matching
-1
Up
Down
Match a URL

don't have to be that complicated

Comments (3) | Add to favourites | Report as malicious

Know a better way?

If you can do better, submit your command here.

What others think

only matches domains starting with www but still nice

Comment by tcfusion 180 weeks and 3 days ago

It should now match http://example.com if you like to give it another try. Good catch BTW!

Comment by putnamhill 179 weeks and 4 days ago

http://foo.com./blah_blah should match too. Mind the last dot in the domain so I added \.? there too + it does not work for .aero, .arpa, .asia, .coop, .info, .jobs, .mobi, .museum, .name and .travel so I extended from 3 to 6

egrep 'https?://([[:alpha:]]([-[:alnum:]]+[[:alnum:]])*\.)+[[:alpha:]]{2,6}(:\d+)?\.?(/([-\w/_\.]*(\?\S+)?)?)?'

Cheers

Comment by bw 177 weeks ago

Your point of view

You must be signed in to comment.

Related sites and podcasts