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:
Tested in bash4
Compares the md5 checksums of the contents of two directories, outputting the checksum and filename where any files differ. Shows only the file name, not the full path.
Compute the md5 checksums for the contents of two mirrored directories, then sort and diff the results. If everything matches, nothing is returned. Otherwise, any checksums which do not match, or which exist in one tree but not the other, are returned. As you might imagine, the output is useful only if no errors are found, because only the checksums, not filenames, are returned. I hope to address this, or that someone else will!
Branch name may be substituted, of course.
This is usefull to diff 2 paths in branches of software, or in different versions of a same zip file. So you can get the real file diff.
Or, if you have restricted access for sftp only, I think you can still do this:
diff /path/to/localfile <(scp user@host:/path/to/remotefile >(cat))
Runs a diff on two files ignore comments and blank lines (diff -I=RE does not work as expected). Adapted from a post found on stackexchange.
Execute a process or list of commands in the given interval and output the difference in output.
Get the list of changed files between revision 43 and HEAD revision: svn diff . -r43:HEAD --summarize
Strip extra 8 characters from every line: cut -c9-99999
Copy the listed files to home/me/destination: cpio -pvdmu ~/destination
Make a plain copy (-p), list files being copied (-v), create needed directories (-d), preserve modification time (-m), overwrite unconditionally (-u)
Good for when your working on building a clean source install for RPM packaging or what have you. After testing, run this command to compare the original extracted source to your working source directory and it will remove the differences that are created when running './configure' and 'make'.
The command will make it easy to determine free IP ranges in a crowded sub-net.
I've been using colordiff for years. wdiff is the new fav, except its colors. Word delimited diffs are more interleaved, easing the chore of associating big blocks of changes.
this alternative shows the differences as they occur so that they are made plain
I use this a lot to sync changes between folders that don't share a SVN or GIT repository. If you want to preview the command before executing, just leave out the last part ("| sh")
The normal output of 'diff' is a wonderful thing. But just sometimes, you want something that is a little more... well... readable.
This is that command.
-d - (optional) find the minimal set of changes
-b - (optional) ignore changes in the amount of whitespace
-B - (optional) ignore changes that just insert or delete blank lines
-y - this is where the magic happens! Use the side-by-side output format.
-w $COLUMNS - more magic! Instead of using 80 columns, use the current width of the terminal.