小时代5-perl对文件按列排序

perl中经常有会遇到处理CSV格式的文件，这样的文件类似二维数组，因此实际上的操作时对二维数组的操作了。
对这样的行列表格，我们常常需要按照某列，或者先按照某列，再按另一列进行排序，具体的操作可以看一下下面的实现：

1.  
2. #!/usr/bin/perl
3. my @line;
4. while（<>）
5. {
6.   chomp;
7.   push @line, [ split ];
8. }
9. foreach ( sort { $a->[0] <=> $b->[0] or $a->[1] <=> $b->[1] or $a->[2] <=> $b->[2] } @line)
10. {
11.   print @$_, "n";
12. }

注意：
对于大的文件，最好不要这么用。
该脚本会把数据全部搬到内存。

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