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list block devices
Shows all block devices in a tree with descruptions of what they are.

exit without saving history
this exits bash without saving the history. unlike explicitly disabling the history in some way, this works anywhere, and it works if you decide *after* issuing the command you don't want logged, that you don't want it logged ... $$ ( or ${$} ) is the pid of the current bash instance this also works perfectly in shells that don't have $$ if you do something like $ kill -9 `readlink /proc/self`

Go up multiple levels of directories quickly and easily.

Record and share your terminal
It replays plain text terminal screencast from http://shelr.tv/

Wait for an already launched program to stop before starting a new command.
Referring to the original post, if you are using $! then that means the process is a child of the current shell, so you can just use `wait $!`. If you are trying to wait for a process created outside of the current shell, then the loop on `kill -0 $PID` is good; although, you can't get the exit status of the process.

Twitpic upload and Tweet

Find files with lines that do not match a pattern
This one would be much faster, as it's only one executed command.

unrar all part1 files in a directory

Print a single route to a destination and its contents exactly as the kernel sees it
Useful to determine the source_ip of outgoing packages to a certain destination

Add sudo with shortcut alt+e in bash


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