#!/usr/bin/awk -f
BEGIN {
  FS=":";
  while ( getline < "/etc/passwd" )
  {
    if ( max_group < $4 )
      max_group = $4;
    group_count[$4]++;
  }
  for ( i=0; i<=max_group; i++ )
    if ( group_count[i] )
      print "A " i " csoportban " group_count[i] " felhasznalo van";
}