How to reverse lines of a text file?

Question

I\'m writing a small shell script that needs to reverse the lines of a text file. Is there a standard filter command to do this sort of thing?

My specific applicatio

Answer 1

Answer is not 42 but tac.

Edit: Slower but more memory consuming using sed

sed 'x;1!H;$!d;x'

and even longer

perl -e'print reverse<>'