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  1. or download this
    #!/usr/bin/perl
    use strict;
    ...
            print $f;
            warn ".";
    }
    
  2. or download this
    . at test.pl line 7.
    . at test.pl line 7.
    ab
    
  3. or download this
    #!/usr/bin/perl
    use strict;
    ...
            print $f;
            warn ;
    }
    
  4. or download this
    Warning: something's wrong at test.pl line 7.
    Warning: something's wrong at test.pl line 7.
    a1
    
  5. or download this
    $ perl -v
    
    This is perl, v5.8.8 built for i486-linux-gnu-thread-multi