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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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Need to encrypt something from the command line? I've used this before to encrypt passwords with a master password that was shared amongst a team.
~$ echo -n 'jA0EAwMCPdknsznAww5gySL1/quqhXg6QgQkIz5abzGP5EZgTbXCFU+y6dP8ySWovytc' | base64 --decode | gpg --decrypt
gpg: CAST5 encrypted data
Enter passphrase: secret
gpg: encrypted with 1 passphrase
Copies a directory structure from /home/ to /backups/home (notice that the destination does not have a trailing slash)
How to figure out what a program is doing.
-tt detailed timestamps
-f also strace any child processes
-v be very verbose, even with common structures
-o write output to file
-s N capture up to N characters of strings, rather than abbreviating with ...
Shows a constantly updating display of disk IO activity. Two sections are in the output. The first is the IO activity since the machine was booted, the second section is the IO activity in the last second
If on a web server (with access to the ssl key), decrypt SSL off the wire