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Check your unread Gmail from the command line
Just an alternative with more advanced formating for readability purpose. It now uses colors (too much for me but it's a kind of proof-of-concept), and adjust columns.

Swap the two last arguments of the current command line
Say you just typed a long command like this: $ rsync -navupogz --delete /long/path/to/dir_a /very/long/path/to/dir_b but you really want to sync dir_b to dir_a. Instead of rewriting all the command line, just type followed by , and your command line will read $ rsync -navupogz --delete /very/long/path/to/dir_b /long/path/to/dir_a

Simple addicting bash game.
hold period (or whatever character) and hit enter after a second. You need to make the next line of periods the same length as the previous line... score starts at 0 and increase each time length of line is same.

about how using internal separate field and store file content on variable

Create a DOS floppy image
mount with: mount -t msdos -o loop ./floppy.img /tmp/mnt

Extract audio from a video

pipe output of a command to your clipboard
In turn you can get the contents of your clipboard by typing xsel by itself with no arguments: $ xsel This command requires you to install the xsel utility which is free

Check if filesystem hangs
When a fs hangs and you've just one console, even # ls could be a dangerous command. Simply put a trailing "&" and play safe

Parse m3u playlist file for total time
Parse an m3u file with seconds for each item and output the length of the entire playlist

Which processes are listening on a specific port (e.g. port 80)
swap out "80" for your port of interest. Can use port number or named ports e.g. "http"

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