#! /usr/bin/perl -w
use strict;

# read the file
open FH , "<" , "/etc/mtab" or die "can't open file";
my @line_list = <FH>;
close FH;

# grep out the "/home" lines
@line_list = grep { m/\/home/ } @line_list;

# search for "nfs" lines
@line_list = grep { m/nfs/ } @line_list;

if (scalar @line_list == 0) {

    print "Do something\n";

} else {

    print "DO something different\n";
}