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| #! /bin/sh
|
| : 'This file is in the public domain, so clarified as of'
| : '2006-07-17 by Arthur David Olson.'
|
| case $#-$1 in
| 2-|2-0*|2-*[!0-9]*)
| echo "$0: wild year - $1" >&2
| exit 1 ;;
| esac
|
| case $#-$2 in
| 2-even)
| case $1 in
| *[24680]) exit 0 ;;
| *) exit 1 ;;
| esac ;;
| 2-nonpres|2-nonuspres)
| case $1 in
| *[02468][048]|*[13579][26]) exit 1 ;;
| *) exit 0 ;;
| esac ;;
| 2-odd)
| case $1 in
| *[13579]) exit 0 ;;
| *) exit 1 ;;
| esac ;;
| 2-uspres)
| case $1 in
| *[02468][048]|*[13579][26]) exit 0 ;;
| *) exit 1 ;;
| esac ;;
| 2-*)
| echo "$0: wild type - $2" >&2 ;;
| esac
|
| echo "$0: usage is $0 year even|odd|uspres|nonpres|nonuspres" >&2
| exit 1
|
|
