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 seconds to human-readable format

Terminal - Convert seconds to human-readable format
date [email protected]
2009-04-11 22:26:41
User: kFiddle
Functions: date
Convert seconds to human-readable format

This example, for example, produces the output, "Fri Feb 13 15:26:30 EST 2009"


There are 2 alternatives - vote for the best!

Terminal - Alternatives

Know a better way?

If you can do better, submit your command here.

What others think

Cool! Except it returns Fri Feb 13 18:31:30 EST 2009. I wonder where the 3hrs 5min different came from?

Comment by birnam 379 weeks and 5 days ago

Grep the archive! http://www.commandlinefu.com/commands/view/1793/then-end-of-the-unix-epoch

Comment by jnash 379 weeks and 5 days ago

On OS X and BSD variants the equivalent seems to be

date -r 1234567890

Comment by qubyte 379 weeks and 4 days ago

[[ `grep -i ego jnash | wc | awk '{print $1}'` -gte 1 ]] && echo "Yep! ;-)" || echo "My bad"

Comment by mark_stafford 379 weeks and 2 days ago

Nice trick. I usually use 'perl -e "print localtime 1234..."' but this is clearly better.

Comment by amosshapira 379 weeks and 1 day ago

Not solaris compatible...

Comment by MoHaG 350 weeks and 1 day ago

Oh god, I wish I knew of this last year. I learned the BSD (in my case OSX) version of date -r 1234567890 and loved it. I talked to a friend of mine and he suggested something along the lines of;

date -d "1234567890 seconds ago UTC"

Needless to say I have a new better way of doing it.

Comment by VxJasonxV 306 weeks and 6 days ago

Your point of view

You must be signed in to comment.