Commands using ps (300)

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convert a mp4 video file to mp3 audio file (multiple files)

bash shell expansion
The expansion {,} in bash will repeat the given string once for each item seperated by commas. The given command will result in the following being run: cp /really/long/path/and/file/name /really/long/path/and/file/name-`date -I` These can be embedded as needed, ex: rm file{1,2,3{1,2,3}} would delete the files file1, file2, file31, file32, file32, and no other files.

List only the directories
-d: list directory entries instead of contents, and do not dereference symbolic links

Find usb device in realtime
Using this command you can track a moment when usb device was attached.

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.

Start an X app remotely
Launch a gui app remotely. In this example smplayer is installed on the remote machine, and movie.avi is in the remote user's home dir. Note that stdout/stderr is still local, so you'll have feedback locally, add '&>/dev/null' to suppress. This is surprisingly not well known (compared to running an X app locally via ssh -X). (NB. if your distro requires ~/.Xauthority file present, then try -fX if you have problems) Resubmitted (and trimmed, thanks sitaram) due to ridiculous voting on previous submission. Fingers crossed, it gets a better rating this time.

Get your external IP and Network Info
Gets all kind of info, ifconfig.me rocks ... for just the ip addess you can use ifconfig.me or ifconfig.me/ip

know the current running shell (the true)
Return the current shell. It is better than print $SHELL which can sometimes return a false value.

Check if *hardware* is 32bit or 64bit
CPU flags: rm --> 16-bit processor (real mode) tm --> 32-bit processor (? mode) lm --> 64-bit processor (long mode)

Rename files in batch


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