Adding *STDOUT = $o; to the above, will make it succeed in redirecting also the print statements which explicitly state the filehandle to be STDOUT, e.g. print STDOUT "...":

perl -I. -e 'open my $o, ">out"; *STDOUT = $o; select $o; require "b.pl";'

In reply to Re^2: Output redirection using “require” in perl by bliako
in thread Output redirection using “require” in perl by Sandeep Kumar

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