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"Clone" a list of installed packages from one Debian/Ubuntu Server to another

change up n directories
Change n directories up, without parameters change one up

Upgrade all perl modules via CPAN

Hiding password while reading it from keyboard
Allow to read password in a script without showing the password inserted by the user

Instantly load bash history of one shell into another running shell
By default bash history of a shell is appended (appended on Ubuntu by default: Look for 'shopt -s histappend' in ~/.bashrc) to history file only after that shell exits. Although after having written to the history file, other running shells do *not* inherit that history - only newly launched shells do. This pair of commands alleviate that.

Get a list of Mageia Linux mirrors providing rsync connectivity for Mageia 4 release
Need to find a Mageia Linux mirror server providing Mageia 4 via rsync? Modify the "url=" string for the version you want. This shows i586 which is the 32bit version. If you want the 64bit version it is: url=http://mirrors.mageia.org/api/mageia.4.x86_64.list; wget -q ${url} -O - | grep rsync:

Advanced python tracing
Trace python statement execution and syscalls invoked during that simultaneously

Undo
Ctrl+_

Display total Kb/Mb/Gb of a folder and each file

Find the package that installed a command


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