#!/usr/local/gnubin/gawk -f

function get_valid_shells (valid_shells,    shellfile)
{
 shellfile = "/etc/shells" ;

 while ((getline < shellfile) > 0)
    if ( $$1 !~ "^#.*" )
       valid_shells[$$1] = $$1 ;

 close(shellfile);
}

function in_fs (homedir, fs)
{
 return match(homedir, "^" fs "/")
}

BEGIN {
   FS = ":"
   total = 0
   get_valid_shells(valid_shells);
   if (ARGC < 2 ) {
      printf("Usage: %s [dir] {passwd-file}\n", ARGV[0]) > "/dev/stderr"
      do_nothing_in_exit = 1;
      exit 1
   }
   dir = ARGV[1];
   ARGV[1] = "";   
}

{
   split($0, fields, ":")
   if (fields[7] == "") fields[7]="/bin/sh"

   if (in_fs(fields[6], dir)) {
      total++;
      if (fields[7] in valid_shells)
         active++
   }
}

END {
   if (! do_nothing_in_exit) {
      printf("Total home directories in %s:   %d\n", dir, total);
      printf("Total active directories in %s: %d\n", dir, active);
   }
}

# eof