#!/bin/sh
# kreator, Wed Mar 20 12:05:41 MET 2002

getfirstid()
{
  awk 'BEGIN { FS=":" }
   { if (($3 >= 50) && ($3 <= 99)) arr[$3] = 1 }
    END { for (j = 50; j <= 99; ++j) if (!(j in arr)) { print j; break }}'
}

getent passwd | getfirstid
getent group | getfirstid