>>>>> "ms419" == ms419  <[EMAIL PROTECTED]> writes:

ms419> How can we test if a user is allowed to login? How can we exec
ms419> programs as another user?

Probably sudo.  But do you *really* want to let a script act as
another user?  And *any* other user?  This sounds Scary.  What invokes
this script?
-- 
Randal L. Schwartz - Stonehenge Consulting Services, Inc. - +1 503 777 0095
<merlyn@stonehenge.com> <URL:http://www.stonehenge.com/merlyn/>
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