$filesystem = $ARGV[0]; #store the file system you would like to run DU command on
if ( $ARGV[0] eq "" ) {
   die "usage: $0 filename\n";
}
$host=`hostname`;
        my %filesystems = (
                            hosta => { desc => 'x', filesystemA => [ qq|/the/first/filesystem|], filesystemB =>  [ qq|/the/second/fielsystem| ] },
                            hostb => { desc => 'r', filesystemA => [ qq|/the/first/filesystem | ], filesystemB => [qq|no filesystemB for 2nd host |]}

        );
$choice = $filesystems{$host};
if ( not $filesystems{filesystemA}{$filesystem} ) {
        print "error\n";
}