sub x
{
    print "Starting with X\n";
    my $ret = _shared_code(@_);
    return "From X: $ret";
}

sub y
{
    print "Starting with Y\n";
    my $ret = _shared_code(@_);
    return "From Y: $ret";
}

sub _shared_code
{
    # Do stuff here
}
[download]

You still get the shared code abstracted out and you get to handle differences. I often do this with structures like:

sub DoFoo { return do_stuff('Foo', @_) }
sub DoBar { return do_stuff('Bar', @_) }
sub DoBaz { return do_stuff('Baz', @_) }

sub do_stuff
{
    my ($name, ...) = @_;

    # Do stuff here
}
[download]

This is usually one of the first steps I take when refactoring a bloated code base.

------
We are the carpenters and bricklayers of the Information Age.

Don't go borrowing trouble. For programmers, this means Worry only about what you need to implement.

Please remember that I'm crufty and crochety. All opinions are purely mine and all code is untested, unless otherwise specified.