Here's something handy for vim power users.

:%s/.*/(&)/g

For those unfortunate souls out there who do not have a clue about what this might be, this regular expression global substitution command will enclose all lines in the current file within parentheses.

Or have even more fun by reversing all of the lines in a file by issuing the following succinct command:

:g/^/mo0

I'm just sawing swiftly through the book Learning the vi and Vim Editor and learning all kinds of nifty stuff to make my editing sessions even more efficient.