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dd with progress bar and statistics
This command utilizes 'pv' to show dd's progress. Notes on use with dd: -- dd block size (bs=...) is a widely debated command-line switch and should usually be between 1024 and 4096. You won't see much performance improvements beyond 4096, but regardless of the block size, dd will transfer every bit of data. -- pv's switch, '-s' should be as close to the size of the data source as possible. -- dd's out file, 'of=...' can be anything as the data within that file are the same regardless of the filename / extension.

Listing directory content of a directory with a lot of entries
Ever wanted to get the directory content with 'ls' or 'find' and had to wait minutes until something was printed? Perl to the rescue. The one-liner above(redirected to a file) took less than five seconds to run in a directory with more man 2 million files. One can adapt it to e.g. delete files that match a certain pattern.

Kill any process with one command using program name
See also: killall

Find the package that installed a command

List of all vim features
The above output is for a custom compiled version of Vim on Arch Linux. Just a quick shell one liner, and presents a list of all the enabled and disabled (those prefixed with a '-') features.

Add all unversioned files to svn

translates acronyms for you
very handy if you are in irc and absolutely don't know what these guys are talking about. this is a netbsd command, if you are lucky it exists in your distro's package database.

Salvage a borked terminal
Also works in places where reset does not.

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.

Lists the size of certain file in every 10 seconds
watch is a command especially designed for doing this job


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