One way is pretty much the same:

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

if ( `grep /home /etc/mtab | grep -c nfs` == 0 ) {

    print "Do something\n";

} else {

    print "DO something different\n";
}
[download]

There is nothing wrong with doing that. It does make the script depend on the "grep" program. A different way is like:

#! /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";
}
[download]

I would see if I could replace both "grep"s with just one and also use a "scalar context" to get the number of matches instead of a line list.

#! /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;

# count the number of "/home" "nfs" lines
my $match_count = grep { m/ \/home nfs / } @line_list;
if ($match_count == 0) {

    print "Do something\n";

} else {

    print "DO something different\n";
}
[download]