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.

Universal configuration monitoring and system of record for IT.

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



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

Press enter and take a WebCam picture.

Terminal - Press enter and take a WebCam picture.
read && ffmpeg -y -r 1 -t 3 -f video4linux2 -vframes 1 -s sxga -i /dev/video0 ~/webcam-$(date +%m_%d_%Y_%H_%M).jpeg
2013-01-17 11:37:09
User: MarxBro
Functions: date read
Press enter and take a WebCam picture.

This command takes a 1280x1024 p picture from the webcam.

If prefer it smaller, try changing the -s parameter: qqvga is the tiniest, vga is 640x480, svga is 800x600 and so on.

Get your smile on and press enter! :)


There is 1 alternative - vote for the best!

Terminal - Alternatives
-y -r 1 -t 3 -f video4linux2 -vframes 1 -s sxga -i /dev/video0 ~/webcam-$(date +%m_%d_%Y_%H_%M).jpeg
2013-02-27 05:32:03
User: navyjeff
Functions: date

Take a picture from your webcam and save it to a jpeg.

A very slightly modified version of MarxBro's command.

Know a better way?

If you can do better, submit your command here.

What others think

heh, that's good fu!

I tried a variation which speaks to you and reminds you to say "cheese" and after taking the shot displays it with "eog" (eye of Gnome)

pic=~/webcam-$(date +%m_%d_%Y_%H_%M).jpeg; espeak "say cheese"; ffmpeg -y -r 1 -t 3 -f video4linux2 -vframes 1 -s vga -i /dev/video0 ${pic}; eog ${pic}
Comment by mpb 202 weeks and 4 days ago

Is the "tead &&" really needed? You have to press enter to run the command so why have the read which requires you hit the enter key a second time?

Comment by mpb 202 weeks and 4 days ago

Hmm, curiously, my attempt to use this results in a split picture. Not sure why?

Comment by mpb 202 weeks and 4 days ago

Glad you liked it!

No, `read &&` is just for launch it with some action.

Can you upload the pic somewhere? Curious about it...

Does it works with sxvga instaead of vga?

Comment by MarxBro 202 weeks and 1 day ago

Apparently the "ffmpeg" command is deprecated:

ffmpeg version 0.8.5-6:0.8.5-1, Copyright (c) 2000-2012 the Libav developers

built on Jan 13 2013 12:05:48 with gcc 4.7.2

*** THIS PROGRAM IS DEPRECATED *** This program is only provided for compatibility and will be removed in a future release. Please use avconv instead.

Does anybody know the equivalent using aconv (or perhaps gstreamer)?

Comment by fmarier 197 weeks and 1 day ago

I just did it with avconv in place of ffmpeg and it worked fine.

avconv -y -r 1 -t 3 -f video4linux2 -vframes 1 -s sxga -i /dev/video0 ~/webcam-$(date +%m_%d_%Y_%H_%M).jpeg
Comment by navyjeff 197 weeks and 1 day ago

Actually, it isnt deprecated, just avconv is a more active and "new" fork of the project and Ubuntu/Debian builds have that msg (I dont have it on my ffmpeg, "slack-builded" from scratch).

Comment by MarxBro 197 weeks ago

Your point of view

You must be signed in to comment.