After adding use Win32;, your shutdown command worked for me (ActivePerl 5.6.1 on Win2k Pro SP4) with no changes. Keep in mind it doesn't work on all versions of Windows. The documentation states it only works on the following OSs:

It will not work on:

By the way, it would be nice if you asked the user if he wanted to reboot before calling this command.

In reply to Re: After changing registry values need to reboot systems by ikegami
in thread After changing registry values need to reboot systems by mallen

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