reversing the order in which lines appear

[Francky Leyn]

Hello,

I'm seeking for some way to revert the order of lines. The first line
read thus must get out last and the last read must be output first.

Although it's easy to write a program for it, I'm wondering if this
is not possible with the UNIX toolbox. Any ideas?

I first tought of something like "cat -r", where the r stand for reverse.
Is this a good suggestion, or a bad one?

Best regards,

Francky