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View network activity of any application or user in realtime
The "-r 2" option puts lsof in repeat mode, with updates every 2 seconds. (Ctrl -c quits) The "-p" option is used to specify the application PID you want to monitor. The "-u' option can be used to keep an eye on a users network activity. "lsof -r 2 -u username -i -a"

hard disk information - Model/serial no.
Get the hard disk information with out shutting down and opening the system. It gives information on model no., serial no., cylinders/heads/sectors, and the supported features of the hard disk.

Set RGB gamma of secondary monitor
This command first determines whether a second screen is connected. If this is the case, it sets the screen's RGB gamma via xrandr. Useful for cheap or slightly defective monitors with a tint. In this example a yellowing/champagne color deviation is compensated for by decreasing the red and the green portion of the image.

Reuse all parameter of the previous command line
!* is all of the arguments to the previous command rather than just the last one. This is useful in many situations. Here's a simple example: $ vi cd /stuff oops! [exit vi, twice] $ !* expands to: cd /stuff

Split File in parts
Split File in 19 MB big parts, putting parts together again via cat Nameforpartaa Nameforpartab Nameforpartac >> File

List only directories, one per line
omit the 1 (one) if you don't need one-per-line

run command on a group of nodes in parallel redirecting outputs
Do the same as pssh, just in shell syntax. Put your hosts in hostlist, one per line. Command outputs are gathered in output and error directories.

Rename files in batch

Find the 20 biggest directories on the current filesystem
This command will tell you the 20 biggest directories starting from your working directory and skips directories on other filesystems. Useful for resolving disk space issues.

Remove security limitations from PDF documents using ghostscript (for Windows)
#4345 also works under windows


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