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use warnings;
use strict;
...
run3 [$cmd,'--version'], undef, \my $out or die "run3: $!";
die "\$?=$?" if $?;
chomp $out;

use warnings;
use strict;
...
my $out = do { local $/; <$fh> };  # slurp
close $fh or die $! ? $! : "\$?=$?";
chomp $out;