If the command runs quickly: 

my $out = `cmd-to-run 2>&1`;
# Should really check command return code via $? special variable here
# Then print $out via your $tee here
# Note: 2>&1 (to fold stderr into stdout) works fine on Windows XP

[download]
If it is a long-running command and you want feedback while it is running: 
open(my $fh, 'cmd-to-run 2>&1 |') or die "open error: $!";
while (<$fh>) {
    # print $_ via your $tee here
}
close($fh) or die "close error: $!";

[download]
And autoflushing stdout ($| = 1;) is prudent in these type of scripts to avoid any intermingling of command stdout and your script's stdout.

In reply to Re: How do I redirect outut from system () to a file and also to screen by eyepopslikeamosquito
in thread How do I redirect outut from system () to a file and also to screen by gim

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