timezone/yearistype

   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