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Comma insertions
Insert a comma where necessary when counting large numbers. I needed to separate huge amounts of packets and after 12+ hours of looking in a terminal, I wanted it in readable form.

List your MACs address

rot13 simple substitution cipher via command line
E.g. Useful for hiding spoilers in reviews, etc.

copy hybrid iso images to USB key for booting from it, progress bar and remaining time are displayed while copying

Continuously listen on a port and respond with a fixed message with netcat (and respond to kill signals)
`while true`: do forever `nc -l -p 4300 -c 'echo hello'`: this is the but anything can go here really `test $? -gt 0 && break`: this checks the return code for ctrl^c or the like and quite the loop, otherwise in order to kill the loop you'd have to get the parent process id and kill it.

Search commandlinefu.com from the command line using the API
for me the above command didn't work for more than one argument but this one does

Get all these commands in a text file with description.
I tried out on my Mac, jot to generate sequence ( 0,25,50,..), you can use 'seq' if it is linux to generate numbers, need curl installed on the machine, then it rocks. @Satya

Using column to format a directory listing
Using column to format a directory listing

Rename files in batch

list block devices
Shows all block devices in a tree with descruptions of what they are.


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