note RhetTbull My favorite way to handle this is with [cpan://Filter::Handle]. For example: <code> use warnings; use strict; use Carp; use Filter::Handle qw/subs/; open (LOGFILE, ">logfile") or die "could not open logfile: $!"; #filter STDERR through an anonymous sub Filter \*STDERR, sub {local $_ = "@_"; print LOGFILE "Filtered: $_ "; $_}; #need a signal handler to capture warnings from carp and warn which are not captured by Filter::Handle (but by capturing ourselves and printing to STDERR, they do get picked up by Filter::Handle) $SIG{__WARN__} = sub {local $_ = "@_"; print STDERR $_}; #prints to both STDERR and to LOGFILE print STDERR "error!\n"; carp "carp!"; warn "warn!"; #STDERR will no longer be filtered through your sub UnFilter \*STDERR; print STDERR "not captured to log\n"; warn "this one got away"; close LOGFILE; </code> <strong>Update:</strong> Added signal handler to capture output of warn and carp 165195 165195