This runs the program twice unnecessarily ;)

Not sure if it is a big deal or not but not required

Update: umbra you mentioned that you are on windows and don't have access to tee. In such cases you can write your own tee. It is very simple. 

# Program tee
#!/usr/bin/perl -w

die "Usage: tee outfile\n" unless @ARGV == 1;
open(OUT,'>', $ARGV[0]) or die $!;
shift;

while (<>) {
    print OUT;
    print;
}

close (OUT) or die $!;

[download]

PS: I wasn't sure how to reply back to you with code as a /msg so decided to update this thread.

In reply to Re^2: Creating an outputfile and processing it at once by sk
in thread Creating an outputfile and processing it at once by monkfan

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