Hi, I post again my question with some changes.Part of my script is like this:

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

   my $taxId = [0-9];
  my $taxId1 = $ARGV[0];
  my $taxId2 = $ARGV[1];

my $C = getDistance ($common_node);
print $C;
sub getParent
{
    my ($taxId) = @_;
    my @parent_list = "";
     while ($taxId = $taxId1){
        my $parent = `getz "[taxonomy:$taxId1]" -f pid`;
        chomp $parent;
        $parent =~ s/PARENT ID                 :/ /;
        $taxId1 = $parent;
        push @parent_list, $parent;
#      
    }
        return @parent_list;    
}
sub getDistance
{
    my ($common_node) = @_;
    my $id;
    my $count;
    do{
       $id = getParent ($taxId);
       $count++;
       }until ($id eq $common_node);
       return $count;
}

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There are some points I have to mention. First in command line I put two taxId1 and taxId2. But I also use taxId (that can be any digit and I am not sure is true or not). Second $common_node is just a number that I defined in main program(not in this post) and I want to find distance between this point and taxId1 or taxId2. In the first subroutine (get parent) I found some numbers that one of those is $common_node and just I want to count from the first number until that point ($common_node). Any response would be appreciated.

In reply to do until question by semi

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