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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.
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HP UX doesn't have a -a switch in the ifconfig command.
This line emulates the same result shown in Solaris, AIX or Linux
Handy use of bc in the command line. No need to get 'into' the bc to perform calculations
Very useful set of commands to know when your file system was created.
Sometimes, you have a lot of NFS in the server and you can't or shouldn't use umount -a. Whis this command, you only umount the fs related to the 'string'