Would you be so kind as to share your favourite one-liners?

I always use:

perl -e 'print <>' filename

Once we have plenty to chose from, I'll make up a one-liner cheat sheet.

I've had a request to ask if you could all explain what the one-liners do as well.


Walking the road to enlightenment... I found a penguin and a camel on the way.....
Fancy a Just ask!!!