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                ## while` (<STDIN>)` 一定要小心這點。如果你不知怎么回事地得到了假值(如:空行),你的文件可能 停止處理了。假如你在處理文件讀取(除非修改了?`$/`),這種事一般不會發生, 但卻可能發生。 你更喜歡這樣運行: ~~~ while (readdir(DIR)) { ~~~ 假設你有文件名為?`0`?的話,那么程序將停止,且不會繼續處理文件。 更合適的?`while`?循環看起來像這樣: ~~~ while ( defined( my $line = <STDIN> ) ) { while ( defined( my $file = readdir(DIR) ) ) { ~~~
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