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Print IP of any interface. Useful for scripts.

enable all bash completions in gentoo
enable each bash completion that you have installed at your system, that's very nice ;)

See system users

Separates each frame of a animated gif file to a counted file, then appends the frames together into one sheet file. Useful for making sprite sheets for games.
requires imagemagick

Shows size of dirs and files, hidden or not, sorted.
Enhanced version: fixes sorting by human readable numbers, and filters out non MB or GB entries that have a G or an M in their name.

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

route output as next command's parameters

Use result of the last command
\$ which python /usr/bin/python \$ ll `!!` lrwxrwxrwx 1 root root 9 2010-11-08 22:01 /usr/bin/python -> python2.6

Copy ssh keys to user@host to enable password-less ssh logins.
Alternative for machines without ssh-copy-id

Embed next line on the end of current line using sed
N: On the current line, sed will display it on pattern space, plus a \n (new line); but s/\n//: Will get rid of new line displayed on pattern space, joining the current line's end with the start of the next line Useful in scripts.


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