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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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greps your bash history for whatever you type in at the end returning it in reverse chronological order (most recent invocations first), should work on all distros.
works well as an alias
Cats a file in reverse.
cut log from line 50 to line 88
cut log from row 100 to row 150.
Remove all empty directories below the current directory. If directories become empty as the results of this, remove those too.
When there is a bad block in the middle of your file, you can see its begninning with `cat' and its end with `tac'. But both commands terminates with an error. So this sequence rebuilds a new file without badblock.
Or "tail -r" on Solaris.