check out the "checkbashisms" script !
Sub is a model for setting up shell programs that use subcommands, like git or rbenv using bash. Making a sub does not require you to write shell scripts in bash, you can write subcommands in any scripting language you prefer.
reptyr is a utility for taking an existing running program and attaching it to a new terminal. Started a long-running process over ssh, but have to leave and don’t want to interrupt it? Just start a screen, use reptyr to grab it, and then kill the ssh ses
Restore Backup of hard disk copy, MBR Backup & Restore
or did you know ~<tab><tab> - All Present Users on system from "/etc/passwd"
Debian/Ubuntu Tips & Tricks