Commands using time (30)

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Boot another OS at next startup

Periodic Log Deletion
deletes logs not modified in over [#] days - modify to compress or move, as needed

Deal with dot files safely

Close specify detached screen
-X Send the specified command to a running screen session. -S Option to specify the screen session if you have several screen sessions running. $screen -ls for listing current screens and its sessionname

Create date-based tgz of current dir, runs in the background, very very cool
This is freaking sweet!!! Here is the full alias, (I didn't want to cause display problems on commandlinefu.com's homepage): $ alias tarred='( ( D=`builtin pwd`; F=$(date +$HOME/`sed "s,[/ ],#,g"

Reducing image size
Adding the exclamation mark to the image geometry ignores the original aspect ratio. More info about image geometry: http://www.imagemagick.org/script/command-line-processing.php#geometry

Run the last command as root
Useful when you forget to use sudo for a command. "!!" grabs the last run command.

Compare a remote dir with a local dir
You can compare directories on two different remote hosts as well: $ diff -y

Set laptop display brightness
Run as root. Path may vary depending on laptop model and video card (this was tested on an Acer laptop with ATI HD3200 video). $ cat /proc/acpi/video/VGA/LCD/brightness to discover the possible values for your display.

Count threads of a jvm process
if you have problem threads problem in tomcat


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