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).

list all file extensions in a directory

Terminal - list all file extensions in a directory
ls -Xp /path/to/dir | grep -Eo "\.[^/]+$" | uniq
2010-08-12 16:32:54
User: karpoke
Functions: grep ls
0
Up
Down
list all file extensions in a directory

If we want files with more than one extension, like .tar.gz, only appear the latest, .gz:

ls -Xp /path/to/dir | grep -Eo "\.[^./]+$" | uniq
Show sample output | Add to favourites | Report as malicious

Alternatives

There are 3 alternatives - vote for the best!

Terminal - Alternatives
find . -type f | awk -F'.' '{print $NF}' | sort| uniq -c | sort -g
2011-02-14 09:15:29
User: cp
Functions: awk find sort uniq
Tags: uniq ls grep
7
Up
Down
list all file extensions in a directory

... plus do a sort according frequency

Show sample output | Comments (0) | Add to favourites | Report as malicious
ls -Xp | grep -Eo "\.[^/]+$" | sort | uniq
2011-02-10 20:47:59
User: Amarok
Functions: grep ls sort
Tags: uniq ls grep
4
Up
Down
list all file extensions in a directory

Works on current directory, with built-in sorting.

Show sample output | Comments (0) | Add to favourites | Report as malicious
find /some/path -type f -printf '%f\n' | grep -o '\..\+$' | sort | uniq -c | sort -rn
2013-03-18 14:42:29
User: skkzsh
Functions: find grep sort uniq
Tags: sort uniq find grep extension
2
Up
Down
list unique file extensions recursively for a path, include extension frequency stats

Get the longest match of file extension (Ex. For 'foo.tar.gz', you get '.tar.gz' instead of '.gz')

Show sample output | Comments (1) | Add to favourites | Report as malicious
find /path/to/dir -type f | grep -o '\.[^./]*$' | sort | uniq
2010-08-12 14:32:48
User: dooblem
Functions: find grep sort
Tags: sort uniq find grep extensions
1
Up
Down
list all file extensions in a directory

Just a little simplification.

Comments (1) | Add to favourites | Report as malicious
find /path/to/dir -type f -name '*.*' | sed 's@.*/.*\.@.@' | sort | uniq
2010-08-12 15:48:54
User: putnamhill
Functions: find sed sort
Tags: sort uniq find extensions
1
Up
Down
list all file extensions in a directory

If your grep doesn't have an -o option, you can use sed instead.

Comments (0) | Add to favourites | Report as malicious

Know a better way?

If you can do better, submit your command here.

What others think

You have to sort results before uniq.

echo -e "1\n2\n1" | uniq

From man uniq :

Note: 'uniq' does not detect repeated lines unless they are adjacent. You may want to sort the

input first, or use `sort -u' without `uniq'.

Comment by dooblem 144 weeks and 2 days ago

@dooblem, I think that it's not necessary because the flag -X of ls sorts alphabetically by extension, so repeated lines are adjacent.

Comment by karpoke 144 weeks and 1 day ago

Your point of view

You must be signed in to comment.

Related sites and podcasts