B::Deparse can help you de-obfuscate code a bit

ppi_dumper can help you intrepret code without running it (tells you what friendly manual to read )

$ ppi_dumper carliz-hacking.pl
PPI::Document
  PPI::Token::Whitespace        '\n'
  PPI::Statement::Variable
    PPI::Token::Word    'my'
    PPI::Token::Whitespace      ' '
    PPI::Token::Symbol          '$file'
    PPI::Token::Whitespace      ' '
    PPI::Token::Operator        '='
    PPI::Token::Whitespace      ' '
    PPI::Token::Symbol          '$ARGV'
    PPI::Structure::Subscript   [ ... ]
      PPI::Statement::Expression
        PPI::Token::Number      '0'
    PPI::Token::Structure       ';'
  PPI::Token::Whitespace        '\n'
  PPI::Statement::Variable
    PPI::Token::Word    'my'
    PPI::Token::Whitespace      ' '
    PPI::Token::Symbol          '$content'
    PPI::Token::Whitespace      ' '
    PPI::Token::Operator        '='
    PPI::Token::Whitespace      ' '
    PPI::Token::Word    'do'
    PPI::Token::Whitespace      ' '
    PPI::Structure::Block       { ... }
      PPI::Token::Whitespace    ' '
      PPI::Statement
        PPI::Token::Word        'open'
        PPI::Token::Whitespace          ' '
        PPI::Token::Word        'my'
        PPI::Token::Whitespace          ' '
        PPI::Token::Symbol      '$fh'
        PPI::Token::Operator    ','
        PPI::Token::Whitespace          ' '
        PPI::Token::Quote::Single       ''<''
        PPI::Token::Operator    ','
        PPI::Token::Whitespace          ' '
        PPI::Token::Symbol      '$file'
        PPI::Token::Whitespace          ' '
        PPI::Token::Operator    'or'
        PPI::Token::Whitespace          ' '
        PPI::Token::Word        'die'
        PPI::Token::Whitespace          ' '
        PPI::Token::Magic       '$!'
        PPI::Token::Structure   ';'
      PPI::Token::Whitespace    ' '
      PPI::Statement::Variable
        PPI::Token::Word        'local'
        PPI::Token::Whitespace          ' '
        PPI::Token::Magic       '$/'
        PPI::Token::Structure   ';'
      PPI::Token::Whitespace    ' '
      PPI::Statement
        PPI::Token::Operator    '<'
        PPI::Token::Symbol      '$fh'
        PPI::Token::Operator    '>'
      PPI::Token::Whitespace    ' '
    PPI::Token::Structure       ';'
  PPI::Token::Whitespace        '\n'
  PPI::Statement::Variable
    PPI::Token::Word    'my'
    PPI::Token::Whitespace      ' '
    PPI::Token::Symbol          '$begin'
    PPI::Token::Whitespace      ' '
    PPI::Token::Operator        '='
    PPI::Token::HereDoc         '<<'THEEND''
    PPI::Token::Structure       ';'
  PPI::Token::Whitespace        '\n'
  PPI::Token::Whitespace        '\n'
  PPI::Statement
    PPI::Token::Word    'eval'
    PPI::Token::Whitespace      ' '
    PPI::Token::Symbol          '$begin'
    PPI::Token::Operator        '.'
    PPI::Token::Symbol          '$content'
    PPI::Token::Structure       ';'
  PPI::Token::Whitespace        '\n'
  PPI::Statement
    PPI::Token::Word    'print'
    PPI::Token::Whitespace      ' '
    PPI::Token::Magic   '$@'
    PPI::Token::Whitespace      ' '
    PPI::Token::Word    'if'
    PPI::Token::Whitespace      ' '
    PPI::Token::Magic   '$@'
    PPI::Token::Structure       ';'
  PPI::Token::Whitespace        '\n'
  PPI::Token::Whitespace        '\n'
[download]

OPerators are documented in perlop, functions in perlfunc, magic variables in perlvar ... its just a matter of looking up each piece you're unsure about... perldoc -f eval

Tutorials: Perl documentation documentation, Searching Perl Documentation, How to Read The Fine Friendly Manual

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