小時代5-perl對檔案按列排序

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perl中經常有會遇到處理CSV格式的檔案，這樣的檔案類似二維數組，因此實際上的操作時對二維數組的操作了。
對這樣的行列表格，我們常常需要按照某列，或者先按照某列，再按另一列進行排序，具體的操作可以看一下下面的實現：

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：
對於大的檔案，最好不要這麼用。
該指令碼會把資料全部搬到記憶體。

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小時代5-perl對檔案按列排序