Commands using mv (214)

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floating point operations in shell scripts
using bc is for sissies. dc is much better :-D Polish notation will rule the world...

Stream YouTube URL directly to mplayer
The original doesn't work for me - but this does. I'm guessing that Youtube updated the video page so the original doesn't work.

drop first column of output by piping to this

Find files that are older than x days
Find files that are older than x days in the working directory and list them. This will recurse all the sub-directories inside the working directory. By changing the value for -mtime, you can adjust the time and by replacing the ls command with, say, rm, you can remove those files if you wish to.

Check if running in an X session
If you want to display a dialog (using xdialog/kdialog/zenity) you need to make sure that you have a valid X session. Checks for the existence of the DISPLAY variable.

processes per user counter
use Linux ;)

restart apache only if config works
making lots of configurations to apache and restarting the server only to find it broken just plain sucks.

Dump bash command history of an active shell user.

Creating ISO Images from CDs/DVDs
create an iso from your cd/dvd-rom device . You need to umount /dev/cdrom before using the cli

Copy ssh keys to user@host to enable password-less ssh logins.
Alternative for machines without ssh-copy-id


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