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Search for a process by name
ps and grep is a dangerous combination -- grep tries to match everything on each line (thus the all too common: grep -v grep hack). ps -C doesn't use grep, it uses the process table for an exact match. Thus, you'll get an accurate list with: ps -fC sh rather finding every process with sh somewhere on the line.

Create a continuous digital clock in Linux terminal
Same effect, only shell commands.

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.

Extract IPv4 addressess from file

An alarm clock using xmms2 and at
I like the order of the arguments better this way.

find co-ordinates of a location
Just add this to your .bashrc file. Use quotes when query has multiple word length.

Alternative size (human readable) of files and directories (biggest last)
using mb it's still readable;) a symbol variation $ du -ms {,.[^.]}* | sort -nk1

Find files of two different extensions and copy them to a directory

slow down CPU and IO for process and its offsprings.

Sort a character string
Sorts a character string, using common shell commands.


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