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:
Get link to external sites of a url
This sorts files in multiple directories by their modification date. Note that sorting is done at the end using "sort", instead of using the "-ltr" options to "ls". This ensures correct results when sorting a large number of files, in which case "find" will call "ls" multiple times.
Get a list of all the unique hostnames from the apache configuration files. Handy to see what sites are running on a server. When i saw the command i had some ideas to make it shorter. Here is my version.
This command give a human readable result without messing up the sorting.
The following displays only the entries that are duplicates.
Uniq command is mostly used in combination with sort command, as
uniq removes duplicates only from a sorted file. i.e In order for uniq to
work, all the duplicate entries should be in the adjacent lines.
ls -al gives all files, sort +4n sorts by 5th field numerically
Sort using kth column using : delimiter
I had the problem that our monitoring showed that the "/" filesystem is >90% full. This command helped me to find out fast which subdirs are the biggest. The system has many NFS-mounts therefore the -x.
cut -f1,2 - IP range 16
cut -f1,2,3 - IP range 24
cut -f1,2,3,4 - IP range 24
"nl -ba" numbers all lines in the file (including empty lines), "sort -nr"
sorts the lines in descending order, and the "cut" command finally removes
the line numbers again.
here's a version which works on OS X.
M is size in megabytes, man expac to see other sizes
%m is install size
%k is download size
This will list all installed packages on a RedHat/CentOS based system, sort them alphabetically, Parse off the version numbers, and delete any duplicate entries.
This is good if you need to build out a mirrored system or rebuild a failing system.
Uses line-porcelain in git blame, which makes it easier to parse the output.
Watch out if you have several USB drives plugged in: it scans the whole /media/ folder !!! You can replace /media/ by the path of a specific USB drive (something like /media/F77A-530B/)
I use a sound recorder and I want to plug the recorder and grab the most recent sound.
That's what this command does.
Use mv instead of cp to move instead of copy.
Change *.wav to the required file type.
Shows sorted by query time, the headers of mysqlbinlog entries. Then is easy to locate the heavier events on the raw log dump
Sometimes you want to see all of the systcls for a given $thing. I happened to need to easily look at all of the vm sysctls between two boxes and compare them. This is what I came up with.
See the summary.