I've just tested it. Actually both of them work. At least on perl 5.6.1.

And also, since you're sending the signal to a process group, don't you need to give it a negative signal value?

Oops. I'm sorry, I missed that. I don't know if it is allowed to write kill '-SIGHUP', .... If not still constants from POSIX.pm can be used instead of numbers:

use POSIX qw(SIGHUP);
kill -(SIGHUP), ....;
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Ilya Martynov (http://martynov.org/)