examples/functions/isvalidip

   1 # Thanks to Chris F. A. Johnson <c.f.a.johnson@rogers.com> for this one
   2 is_validip()
   3 {
   4         case "$*" in
   5         ""|*[!0-9.]*|*[!0-9]) return 1 ;;
   6         esac
   7
   8         local IFS=.
   9         set -- $*
  10
  11         [ $# -eq 4 ] &&
  12             [ ${1:-666} -le 255 ] && [ ${2:-666} -le 255 ] &&
  13             [ ${3:-666} -le 255 ] && [ ${4:-666} -le 254 ]
  14 }