1 #! /bin/sh 2 3 : 'This file is in the public domain, so clarified as of' 4 : '2006-07-17 by Arthur David Olson.' 5 6 : '@(#)yearistype.sh 8.2' 7 8 case $#-$1 in 9 2-|2-0*|2-*[!0-9]*) 10 echo "$0: wild year - $1" >&2 11 exit 1 ;; 12 esac 13 14 case $#-$2 in 15 2-even) 16 case $1 in 17 *[24680]) exit 0 ;; 18 *) exit 1 ;; 19 esac ;; 20 2-nonpres|2-nonuspres) 21 case $1 in 22 *[02468][048]|*[13579][26]) exit 1 ;; 23 *) exit 0 ;; 24 esac ;; 25 2-odd) 26 case $1 in 27 *[13579]) exit 0 ;; 28 *) exit 1 ;; 29 esac ;; 30 2-uspres) 31 case $1 in 32 *[02468][048]|*[13579][26]) exit 0 ;; 33 *) exit 1 ;; 34 esac ;; 35 2-*) 36 echo "$0: wild type - $2" >&2 ;; 37 esac 38 39 echo "$0: usage is $0 year even|odd|uspres|nonpres|nonuspres" >&2 40 exit 1 41
