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Runs previous command replacing foo by bar every time that foo appears
Very useful for rerunning a long command changing some arguments globally. As opposed to ^foo^bar, which only replaces the first occurrence of foo, this one changes every occurrence.

List just the executable files (or directories) in current directory
Does an 'ls' on just the files and directories in the current directory with an execute bit turned on. This version will list directories. Just tack on "-type f" to the start of the find to omit listing directories and list only files.

aplay some whitenoise
Plays whitenoise from /dev/urandom.

Count opening and closing braces in a string.
This function counts the opening and closing braces in a string. This is useful if you have eg long boolean expressions with many braces and you simply want to check if you didn't forget to close one.

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

Copy an element from the previous command
'n' is a non-negative integer. Using 0 will expand to the name of the previous command.

check open ports without netstat or lsof

Convert mysql database from latin1 to utf8
MySQL: CHARSET from latin1 to utf8

List the Sizes of Folders and Directories
I wanted an easy way to list out the sizes of directories and all of the contents of those directories recursively.

Use QuickLook from the command line without verbose output


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