Read 20 lines when pressing n for next

Hi,
I would like to write a perl script with the following criteria match.
1. open any text file taken the name from the command line.
2. read top 20 lines and stops, then
3. ask to press letter "n or p" (for next/previous) to print next or
previous 20 lines.
would appreciate any kind of help.
4. must have subroutine used.

thanks
.

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