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.

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.

UpGuard checks and validates configurations for every major OS, network device, and cloud provider.

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:



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!

Top Tags



Pick a random image from a directory (and subdirectories) every thirty minutes and set it as xfce4 wallpaper

Terminal - Pick a random image from a directory (and subdirectories) every thirty minutes and set it as xfce4 wallpaper
while :; do xfconf-query -c xfce4-desktop -p /backdrop/screen0/monitor0/image-path -s "$(find <image-directory> -type f -iregex '.*\.\(bmp\|gif\|jpg\|png\)$' | sort -R | head -1)"; sleep 30m; done
2009-04-30 03:09:52
Functions: sleep
Pick a random image from a directory (and subdirectories) every thirty minutes and set it as xfce4 wallpaper

Change your wallpaper every thirty minutes (or however long you like, I suppose) to a randomly selected image in a directory and subdirectories. Bear in mind this is not safe to use if anyone else has write access to your image directory.


There are 3 alternatives - vote for the best!

Terminal - Alternatives

Know a better way?

If you can do better, submit your command here.

What others think

You could use the AWN applet configured so that everytime you want a random wallpaper you just click it and it changes

Comment by wrongloop 468 weeks and 3 days ago

bash: xfconf-query: command not found

Using Ubuntu 8.04.2 (Hardy)

Comment by eseven73 468 weeks and 3 days ago

Would be cool to combine with Gnome wallpaper:


Comment by sudopeople 468 weeks and 3 days ago

@eseven73: Sorry, should have specified it only works with xfce4 4.6.0 or later.

Comment by TheMightyBuzzard 468 weeks and 3 days ago

This would be cool to combine with wikipedia's lists of wallpaper in their 'Category:Wikipedia featured desktop backgrounds' if you'd use this script to pull down a random new background instead of using a directory.

Comment by leon 467 weeks and 4 days ago

fwiw "while true" is same as "while :" not a huge gain but saves you 3 chars.

Comment by argv 410 weeks and 6 days ago

@argv Cheers and good call.

Comment by TheMightyBuzzard 410 weeks and 5 days ago


I've just posted an alternative, using crontab (user = lawck). ^_^

in that case, you'd set it as:

sudo crontab -u username -e

and add the following line:

*/30 * * * * /bin/sh

Comment by lawck 266 weeks and 1 day ago

*/30 * * * * /bin/sh path-to-script

Comment by lawck 266 weeks and 1 day ago

Your point of view

You must be signed in to comment.