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/
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.
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.
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:
works on all Unices
works one bash and ksh.
Note that this assumes the application is an SVN checkout and so we have to throw away all the .svn files before making the substitution.
wraps text lines at the specified width (90 here).
-s option is to force to wrap on blank characters
-b count bytes instead of columns
The nl command lists the contents of a file where is each line is prefixed by a line number. For more information about this command, check out its man page. I tested under Mac OS X and Xubuntu 9.04
You can then switch from a file to another with ^W^W
The hyphen tells vim to open from STDOUT - saves having to create temporary files.
This is the solution to the common mistake made by sudo newbies, since
sudo echo "foo bar" >> /path/to/some/file
does NOT add to the file as root.
sudo echo "foo bar" > /path/to/some/file
should be replaced by
echo "foo bar" | sudo tee /path/to/some/file
And you can add a >/dev/null in the end if you're not interested in the tee stdout :
echo "foo bar" | sudo tee -a /path/to/some/file >/dev/null
Filter comments and empty lines in files. I find this very useful when trying to find what values are actually set in a very long example config file.
I often set an alias for it, like :
alias nocomment='grep -v "^\($\|#\)"'
See which files differ in a diff, and how many changes there are. Very useful when you have tons of differences.
Very useful when the ssh key of a host has changed and ssh refuses to connect to the machine, while giving you the line number that has changed in ~/.ssh/known_hosts.
Sed stops parsing at the match and so is much more effecient than piping head into tail or similar. Grab a line range using
sed '999995,1000005!d' < my_massive_file