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remove all spaces from all files in current folder

Download all images from a 4chan thread
First (and only) argument should be a 4chan thread URL.

OSX command to take badly formatted xml from the clipboard, cleans it up and puts it back into the clipboard.
This command can be used with xclip or xsel for use on a linux box.

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

Don't save commands in bash history (only for current session)
Unsetting HISTFILE avoid getting current session history list saved.

use vim to get colorful diff output
:q to quit

watch process stack, sampled at 1s intervals
This command repeatedly gets the specified process' stack using pstack (which is an insanely clever and tiny wrapper for gdb) and displays it fullscreen. Since it updates every second, you rapidly get an idea of where your program is stuck or spending time. The 'tac' is used to make the output grow down, which makes it less jumpy. If the output is too big for your screen, you can always leave the 'tac' off to see the inner calls. (Or, better yet--get a bigger screen.) Caveats: Won't work with stripped binaries and probably not well with threads, but you don't want to strip your binaries or use threads anyway.

Find the process you are looking for minus the grepped one
faster ;) but your idea is really cool

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"

Speed up the keyboard repeat rate in X server


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