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  1. or download this
    #!/usr/local/bin/perl -w
use strict;
...
  my $s = -s F;
  warn "$s != $_" if $s != $_;
}
  2. or download this
    #!/usr/local/bin/perl -w
use strict;
...
  my $s = -s F;
  warn "$s != $_" if $s != $_;
}
  3. or download this
    0 != 1 at test.pl line 7.
0 != 2 at test.pl line 7.
0 != 3 at test.pl line 7.