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:
printf reapeats the format as longer as it has arguments. Then the idea is to make cut retain as much fields as we have elements in the array.
As usual with such join/split string manipulation, you have to make sure you don't have conflicts between your separator and your array content.
shows number of mysql bin log events (which are mysql server events) per minute, useful to check stress times postmortem
Group membership in OS X is a mish-mash of standards that end up meaning there's almost a half-dozen of ways to belong to a group, what with group inheritance and automatic assignment. This means there's no easy command to find out all groups a user belongs to. The only sensible way then is to list all users and then query each user for membership.
NOTE: This is a function. Once input you can execute it by calling with a groupname.
When I do a major change in my entities, I want to find a way to find all my Entities names and create the commande for me.
So instead of doing ls src/Your/OwnBundle... and then do it manually, this helps a lot.
from my bashrc ;)
adjusting the field "f1" will give you additional information such as
f1 = 98%
f2 = discharging
f3 = 2:02 remaining
You must spezify /where folder and / folder
If you have another camera you must experiment with Exif data (after -g and after grep) and mask of your photo files IMG_????.JPG
I have do it on Knoppix 6.7.0
You must have installed exiv2.
A simple script for download all the MegaTokyo strips from the first to the last one
I alias this as "tach":
alias tach='screen -x `screen -ls | grep Detached | cut -c -10`'
If you have several detached sessions it will just grab the first one. If you're running nested screens you can open new outer windows and run tach repeatedly to grab all the detached sessions into that one.
This one liner is to kill all google chrome tabs. This works similar to $ killall firefox command which is to kill all firefox processes.
depends on date format locale ...
useful to count events in logs
Certain Flash video players (e.g. Youtube) write their video streams to disk in /tmp/ , but the files are unlinked. i.e. the player creates the file and then immediately deletes the filename (unlinking files in this way makes it hard to find them, and/or ensures their cleanup if the browser or plugin should crash etc.) But as long as the flash plugin's process runs, a file descriptor remains in its /proc/ hierarchy, from which we (and the player) still have access to the file. The method above worked nicely for me when I had 50 tabs open with Youtube videos and didn't want to have to re-download them all with some tool.
See who is using a specific port. Especially when you're using AIX. In Ubuntu, for example, this can easily be seen with the netstat command.
Only the number of calls nothing else.
Use the excellent sensiblepasswords.com to a generate random (yet easy-to-remember) password every second, and copy it to the clipboard. Useful for generating a list of passwords and pasting them into a spreadsheet.
This script uses "madebynathan"'s "cb" function (http://madebynathan.com/2011/10/04/a-nicer-way-to-use-xclip/); you could also replace "cb" with
xclip -selection c
Remove "while true; do" and "; done" to generate and copy only 1 password.
Overwrite all sectors with zeros in one pass with ETA and speed status. If you wish to do more passes, encapsulate the line in a for loop (7 pass example):
for f in `seq 1 7`; do pv -s `fdisk -l /dev/sdX|grep "Disk /"|cut -d' ' -f5` /dev/zero >/dev/sdX ; done
Note: Substitute /dev/sdX with the correct drive you wish to erase. Also, you may have to be root to execute the command.
KDE Development Platform: 4.7.3 (4.7.3)
KIO Client: 2.0
This is a handy command to put into ~/.bash_logout to automatically un-mount windows shares whenever the user logs out. If you use this on as a non-root account then you'll need to append sudo before umount and the user will need to have the appropriate sudoer rights to run the /bin/umount command.