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:
changes the PS1 to something better than default.
[username.hostname.last-2-digits-of-ip] (current directory)
gpg command to encrypt a file on the command line.
gpg command to decrypt a previously encrypted file on the command line.
Can be optionally made into an alias:
alias decrypt='gpg --output foo.txt --decrypt foo.txt.pgp'
For quick validation of folder's file-contents (structure not taken into account) - I use it mostly to check if two folders' contents are the same.
-p PID and name of the program
-u on a UDP port.
-t also TCP ports
-o networking timer
-n numeric IP addresses (don't resolve them)
-a all sockets
show phpinfo(); from the command line
This command converts a MySQL query directly into a .csv (Comma Seperated Value)-file.
You can read, add, delete and modify Windows permissions from Linux using smbcacls from the smb-client package.
Very useful set of commands to know when your file system was created.
Sometimes, you have a lot of NFS in the server and you can't or shouldn't use umount -a. Whis this command, you only umount the fs related to the 'string'
Replace sed regular expressions with perl patterns on the command line.
The sed equivalent is: echo "sed -e"|sed -e 's/sed -e/perl -pe/'
In addition to a swap partition, Linux can also use a swap file. Some programs, like g++, can use huge amounts of virtual memory, requiring the temporary creation of extra space.
While at the command line of of hosta, scp a file from remote hostb to remote hostc. This saves the step of logging into hostb and then issuing the scp command to hostc.
Simply pass an argument to the script to convert the manual page to a PDF:
This let you know which modules has loaded the Apache server, very useful to know if the mod_rewrite is ready to use.
Note the extra space before the command (I had to put it as an underscore since the website eats up preceding spaces). That's all it takes. Now if you check your history with "$ history", it wont show up.
Great for finding which jar some pesky class is hiding in!
For a python project, sometimes I need to clean all the compiled python files. I have an alias 'rmpyc' to this command. This really saves me a lot of typing and hunting throughout the folders to delete those files.
So you have a web site and you've plastered your significant other's name all over it. But you broke up with them and have some new love in your life. How do you find all those instances of their name and replace them?
If are a Bash user and you are in a directory and need to go else where for a while but don't want to lose where you were, use pushd instead of cd.
popd (returns you to /home/complicated/path/.I/dont/want/to/forget)
Backups all MySQL databases to individual files. Can be put into a script that grabs current date so you have per day backups.