Where does the output come from is this an output of your perl program? If yes just use multiple print statements: 
open my $out_file, '>>', 'myoutputfilename.txt' or die "$!";
my $output = 'blablabla';
print $output;           # print to screen
print $out_file $output; # print to file

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UPDATE: corrected some typos and added the die statement to open

In reply to Re: print the output on the screen and to a file by wwe
in thread print the output on the screen and to a file by rkshyam

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