The problem is that and has a lower priority as =. This means that you wrote 
( my $flag2= $flag ) and ((-M '/tmp/c') > (-M '/tmp/d'));

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instead of 
my $flag2= $flag && ((-M '/tmp/c') > (-M '/tmp/d'));

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Boris

In reply to Re: Warning with file test(-M) by borisz
in thread Warning with file test(-M) by na

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