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.

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



convert png into jpg using imagemagick

Terminal - convert png into jpg using imagemagick
for img in *.png; do convert "$img" "$img.jpg" ; done
2012-03-03 11:03:08
User: eastwind
convert png into jpg using imagemagick


There are 4 alternatives - vote for the best!

Terminal - Alternatives

Know a better way?

If you can do better, submit your command here.

What others think

That's a bit ugly. You end up with lots of files called picture.png.jpg

How about this:

for img in *.png; do convert "$img" "${img%png}jpg" ; done

It strips off the suffix (png), then adds a new one (jpg).

Comment by flatcap 220 weeks and 6 days ago

or you could use sed, but flatcaps is a better way

for img in *.png; do convert "$img" "$img.jpg" | sed 's/\.png$/\.jpg/'

Comment by chrismccoy 220 weeks ago

Why so complicated? Try

mogrify -format jpg *.png
Comment by soundray 216 weeks and 2 days ago

Your point of view

You must be signed in to comment.