Consider using List::Compare to compare the two arrays. Below is an example of its use. The results show items that appear only in the left list contained by @array1:
use strict;
use warnings;
use List::Compare;
my @array1 = split /\n/, <<END1;
/home filer1232:/vol/home1
/mystuff filer1233:/vol/project
/data filer1234:/vol/example_data
/software filer1255:/vol/my_software
/tools filer1235:/vol/my_tools
/docs filer146:/vol/my_documents
END1
my @array2 = split /\n/, <<END2;
/home filer1232:/vol/home1
/mystuff filer1233:/vol/project
/data filer1234:/vol/example_data
/tools filer1235:/vol/my_tools
END2
my $lc = List::Compare->new( \@array1, \@array2 );
my @Lonly = $lc->get_unique;
print "$_\n" for @Lonly;
Output:
/docs filer146:/vol/my_documents
/software filer1255:/vol/my_software