Spectial Variables Perl的特色之一就是有超過50個以上的特殊變數，這些變數都是全域變數，用來設定程式的執行環境和其它細節。若你想深入瞭解Perl程式設計，那麼這些東西是不可或缺的。在這裡我只列幾個常用的特殊變數以供參考，有興趣的人請自行查閱。
| $_ | The default input and pattern-searching space. |
| $digit | Contains the subpattern from a successful parentheses pattern match. |
| $. | The current input line number of last filehandle read. |
| $! | Contains the current value of errno. |
| $0 | The name of the file of the Perl script. |
| @ARGV | The command line arguments issued when the script was started. |
| @_ | The parameter array for subroutines. |
| %ENV | This associative array contains your current environment. |
