my @hashes = (
    {name=>'a', flag=>1},
    {name=>'a', flag=>0},
    {name=>'b', flag=>1},
    {name=>'c', flag=>0},
    {name=>'b', flag=>0}
);

@hashes = 
    sort { $a->{name} cmp $b->{name} or $a->{flag} cmp $b->{flag} } @hashes;


The order that this gives me is:
name: a  flag: 0
name: b  flag: 0
name: c  flag: 0
name: a  flag: 1
name: b  flag: 1


But what I want is:
name: a  flag: 1
name: b  flag: 1
name: a  flag: 0
name: b  flag: 0
name: c  flag: 0