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Get IPv4 of eth0 for use with scripts
Simple and easy. No regex, no search and replace. Just clean, built-in tools.

Write comments to your history.
A null operation with the name 'comment', allowing comments to be written to HISTFILE. Prepending '#' to a command will *not* write the command to the history file, although it will be available for the current session, thus '#' is not useful for keeping track of comments past the current session.

Perl One Liner to Generate a Random IP Address
A bash version.

print line and execute it in BASH
!# is the currennt line so far, by using !#:- you can go from the second arg (it's zero indexed) to the last ($) (did I understand the problem correctly?)

which program is this port belongs to ?
Sometimes you need to use a port that is already opened by some program , and you don't know who to "kill" for it to release - so, now you do !

Find the package that installed a command

Find default gateway (proper at ppp connections too)

Send apache log to syslog-ng
Send apache log to syslog-ng server without change configuration of syslog. Just add in httpd.conf or vhost conf.

Delete all non-printing characters from a file
tr has some predefined sets of characters that are more convenient to use than characters codes

Vectorize xkcd strips
Uses ImageMagick and potrace to vectorize the input image, with parameters optimized for xkcd-like pictures.


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