perl sort 函数用法

sort函数用来对数组进行排序。用法如下：

#按字符排序 @articles = sort @files;

#按字符排序，显式说明 @articles = sort {$a cmp $b} @files;

#按字符排序，忽略大小写 @articles = sort {uc($a) cmp uc($b)} @files;

#按字符排序，逆序 @articles = sort {$b cmp $a} @files;

#按数字顺序排序 @articles = sort {$a <=> $b} @files;

#按数字顺序排序，逆序 @articles = sort {$b <=> $a} @files;

#按散列的值排序 @oldest = sort {$age{$b} <=> $age{$a} } keys %age;