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commandlinefu.com is the place to record those command-line gems that you return to again and again. That way others can gain from your CLI wisdom and you from theirs too. All commands can be commented on, discussed and voted up or down.

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Unzip 25 zip files files at once

tell if a port is in use
if you don't do --numeric-ports, netstat will try to resolve them to names

Google text-to-speech in local language or language of choice
Google text-to-speech in your local language or in language of choice via country code switch (ISO 639-1).

Print a row of 50 hyphens
Perl is installed by default on most modern OS when jot is not.

Look for English words in /dev/urandom
Little faster alternative.

Binary clock
cryptic version

Recording the desktop and an application audio source for webcast
You will have to use the sound preferences (record) to choose the audio source and set it to internal.

Find all files that have nasty names
Get a list of file names that may cause problems (eg being served on a webserver, typing a URL on a mobile, etc)

infile search and replace on N files (including backup of the files)
the addition of ".bk" to the regular "pie" idiom makes perl create a backup of every file with the extension ".bk", in case it b0rks something and you want it back

Show exit status of all portions of a piped command eg. ls |this_doesn't_exist |wc


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