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Every new command is wrapped in a tweet and posted to Twitter. Following the stream is a great way of staying abreast of the latest commands. For the more discerning, there are Twitter accounts for commands that get a minimum of 3 and 10 votes - that way only the great commands get tweeted.
Use your favourite RSS aggregator to stay in touch with the latest commands. There are feeds mirroring the 3 Twitter streams as well as for virtually every other subset (users, tags, functions,…):
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Use optimized sed to big file/stream to reduce execution time
sed '/foo/ s/foo/foobar/g' <filename>
insted of sed
Finds all tables that need optimising and loops through them, running optimise against them. This works server-wide, on all databases and tables.
-o : optimize
-p : asks for password
-u : user to use for authentication
For Mac OS X users only
Sqlite database keeps collecting cruft as time passes, which can be cleaned by the 'vacuum;' command. This command cleans up the cruft in all sqlite files relating to the user you have logged in as. This command has to be run when firefox is not running, or it will exit displaying the pid of the firefox running.