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





Delete the specified line

Terminal - Delete the specified line
sed -i 8d ~/.ssh/known_hosts
2009-03-03 01:13:28
User: prayer
Functions: sed
Delete the specified line


There are 3 alternatives - vote for the best!

Terminal - Alternatives
sed -i 3d ~/.ssh/known_hosts
2011-05-26 11:34:03
User: evandrix
Functions: sed

deletes line 3 in known_hosts text file

Know a better way?

If you can do better, submit your command here.

What others think

The -e option isn't needed in this example (at least not on the two different linux systems I ran it on [CentOS 5, and a very old SUSE 7]).

Comment by leper421 351 weeks and 1 day ago

meh. i meant to hit up, but my mouse moved as i clicked, and i accidentally voted it down. sorry.

i love this command. this beats hands down opening the file with vim, locating the line, and deleting it. quick, easy, painless. great command.

Comment by atoponce 351 weeks and 1 day ago

I have and old Solaris 9 and this doesn't work. Any alternate way to do the same?

uname -srmp

SunOS 5.9 sun4u sparc

sed -i

sed: illegal option -- i

Comment by Kaio 245 weeks ago

Your point of view

You must be signed in to comment.