Making a copy of STDOUT that redirects the text that gets printed is one way, though there are probably better solutions than this...

#!/usr/bin/perl -w
use strict;
print "Print this\n";
{
    local *STDOUT;
    open(STDOUT,">/dev/null");
    # don't allow this include file to print anything
    do "test.inc";
    close(STDOUT)
}
print "Print this too\n";
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Here's a real direct way to do it:

{
    my $variable_for_file = 'moose';
    local *CORE::GLOBAL::print  = sub {1};
    local *CORE::GLOBAL::printf = sub {1};
    do file.inc;
}
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Update: This doesn't work - peer into the future and see !Overriding Builtin print.

After Compline,
Zaxo

$oldFH = select(NOTHING);
do "filename.txt";
print "Won't Print\n";
select($oldFH);
print "Will Print\n";
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print STDOUT "This will print";
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Or (same idea different way):

use strict;
use IO::Null;

print "Printing\n";

{
    local *STDOUT = IO::Null->new();
    print "Not printing\n";
}

print "Printing again\n";
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perldoc -f open and search for redirect...

in short using a un*x, but read the above mentioned part for the complete story:

open STDOUT, '>', "/dev/null";
open STDERR, '>&STDOUT';
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regards,
tomte

While several people have given you good answers for what you are trying to do, maybe you should examine why you are trying to do it.

IMO (so take it for what its worth) this seems like a nasty hack that could bite you or someone else down the road when you try to maintain this code. Its much better to write your modules in such away that they simply return what you want rather than outputting something to STDOUT. Also, while using do in this manner is not depreciated perldoc clearly states that using use or require is generally a better idea for importing code.

Finally, nitpick: Perl modules most often end in a '.pm' or '.pl' extension, a good idea because then anyone else who might maintain your code in the future will know that it is a perl module. (Sorry my hatred of PHP gets the better of me from time to time :) )

Chris