Looking at perlvar for $< and $>, it suggests that you may want to call POSIX::setuid() to set both in one call. Would that work for you? Or would simply setting both, $< and $> work for you, too?

($<,$>)= ($run_as, $run_as);

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or 
use POSIX qw(setuid);

setuid( $run_as );

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In reply to Re: Running process as another user by Corion
in thread Running process as another user by morgon

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