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:
For users looking to simplify management of large entries in files and directories, this command is the key to fun and simplicity. Using the power sort, only a couple of seconds are necessary to accomplish what would take minutes or hours in ?standard? client applications.
I use this to pull the last commit date for everything in my repo, so I can tell the client which files haven't been touched or updated since the repo was created. Another way to do it is to use svn log, but that does not pull the "kind" attribute. It does, however, give you the commit message. Both are very useful.
works "out of the box" on ubuntu 8.10
Sometimes you need to use a port that is already opened by some program , and you don't know who to "kill" for it to release - so, now you do !
Use the find command to match certain files and summarise their total size in KBytes.
Greps located files for an expression.
Example greps all LaTeX files for 'foo':
locate *.tex | xargs grep foo
To avoid searching thousands of files with grep it could be usefull to test first how much files are returned by locate:
locate -c *.tex
After every line in targetfile (empty lines included) insert in a line from addfile. "Save" results to savefile. Addfile should be longer than targetfile since this doesn't loop back to the top of addfile.
/^/R addfile -- says for every line that matches "has a start of line" output a line from the file addfile.
> savefile (optional) -- redirect output to savefile file.
A variation of a script I found on this site and then slimmed down to just use awk. It displays all users who have attempted to login to the box and failed using SSH. Pipe it to the sort command to see which usernames have the most failed logins.
Quick and dirty command that counts how many words can be typed just using the home row on the Dvorak Simplified Keyboard layout from a dictionary file, in this case /usr/share/dict/words.
According to the regular expression supplied, each word must contain all the keys on the Dvorak home row, and no other characters. For comparison, I've shown how many words are installed in my dictionary, how many can be typed with just the Dvorak home row and how many can be typed with just the QWERTY home row in the sample output. Nearly 10 times the amount.
If you want to see the words, remove the -c switch, and each word will be printed out.
xml with verbose commenting can be difficult to read. remove comments from xml.
converts RAW files from a Nikon DSLR to jpg for easy viewing etc.
requires ufraw package
This will view the console and assumes the screen is 80 characters wide.
Use /dev/vcs2 for the next virtual console.. etc.
Downloads at 12:00
Converts images (maybe from scans) into a PDF
Other logs can be monitored similarly, e.g.
watch "tail -15 /var/log/daemon.log"
When you fill a formular with Firefox, you see things you entered in previous formulars with same field names. This command list everything Firefox has registered. Using a "delete from", you can remove anoying Google queries, for example ;-)