Thanks for the many answers, but I'm a bit confused. Here's the problem: I'm trying to traverse a version tree in a SCM tool (Continuus). Since you can only traverse 1 level at a time. So I run a command like this:

my $tree = {
name => undef,
children => [],
};

foreach (`command($tree->{name})`){
   pseudo: add $_ to children[] for this $tree->{name};
}
pseudo add all the childrens children.
[download]

Could you please give an newbie example?
Thanks,
Rune