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. |