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trace the system calls made by a process (and its children)
strace can be invaluable in trying to figure out what the heck some misbehaving program is doing. There are number of useful flags to limit and control its output, and to attach to already running programs. (See also 'ltrace'.)

floating point operations in shell scripts
using bc is for sissies. dc is much better :-D Polish notation will rule the world...

let a cow tell you your fortune

view all lines without comments.

Which processes are listening on a specific port (e.g. port 80)
swap out "80" for your port of interest. Can use port number or named ports e.g. "http"

Read null character seperated fields from a file
Handle any bad named file which contains ",',\n,\b,\t,` etc Store the file name as null character separated list $find . -print0 >name.lst and retrieve it using $read -r -d "" Eg: $find . -print0 >name.lst; $cat name.lst| while IFS="" read -r -d "" file; $do $ls -l "$file"; $done

Get information about a video file

find text in a file
this will find text in the directory you specify and give you line where it appears.

Connect to google talk through ssh by setting your IM client to use the localhost 5432 port
If your firewall or proxy at your location prevents connection to a particular host or port, you can use ssh to tunnel to your home server and do it there instead.

Print only the odd lines of a file (GNU sed)
The tilde address operator is an extension of GNU sed. It won't work with POSIX sed.


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