in reply to Small examples of string eval
I have several scripts that take numeric arguments from the command line where is is extremely useful to be able to enter expressions instead of simple values.
#! perl -slw use strict; our $LIMIT = eval $LIMIT || 'somedefault';
This way I can specify
script -LIMIT=2**33 or script -LIMIT=8*1024**3
Which beats the crap out of trying to remember