in reply to force user to only enter numbers

Perl's documentation is available both online and at your command prompt. There is even a FAQ:

perldoc -q number

UPDATE: Fixed typo (-f should have been -q)

Replies are listed 'Best First'.
Re^2: force user to only enter numbers
by pvaldes (Chaplain) on Sep 02, 2011 at 16:28 UTC
    perldoc -f number

    No documentation for perl function `number' found

    perldoc number
[reply]
[d/l]
[select]
[reply]
[d/l]

In Section Seekers of Perl Wisdom