I can guess that you declared yout $opt_... variables with my(). Since my() scopes the variables to the lexical block, the variables you declared are not visible to Getopt::Std.
Instead, you should declare the variables with use vars:
use vars qw($opt_h $opt_s);
(In perl5.6, you could declare them with our instead.)
Alternatively, you could switch to Getopt::Long, which allows you to specify whatever variables you want to get the values of the options. It has other useful features as well.
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