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  1. or download this
    use Cwd;
    print cwd()."\n";
    
  2. or download this
    # /usr/local/src/perl/> perl test.pl
    /usr/local/src/perl
    
  3. or download this
    # /home/foobar/> perl /usr/local/src/perl/test.pl
    /home/foobar