Linux BASH 中多列文件的反向排序
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Reverse sort order of a multicolumn file in BASH
提问by Valerio D. Ciotti
I've the following file:
我有以下文件：
1 2 3
1 4 5
1 6 7
2 3 5
5 2 1
and I want that the file be sorted for the second column but from the largest number (in this case 6) to the smallest. I've tried with
我希望文件按第二列排序，但从最大数字（在本例中为 6）到最小数字。我试过
sort +1 -2 file.dat
but it gives me the inversed order.
但它给了我相反的顺序。
The results should be:
结果应该是：
1 6 7
1 4 5
2 3 5
5 2 1
1 2 3
采纳答案by Danstahr
sort -nrk 2,2
does the trick.
诀窍。
n for numeric sorting, r for reverse order and k 2,2 for the second column.
n 用于数字排序，r 用于逆序，k 2,2 用于第二列。
回答by Brian Agnew
Have you tried -r ? From the man page:
你试过 -r 吗？从手册页：
-r, --reverse
reverse the result of comparisons
-r, --reverse
reverse the result of comparisons
回答by Chris Seymour
As mention most version of sorthave the -roption if yours doesn't try tac:
如前所述，如果您不尝试，大多数版本sort都有-r选项tac：
$ sort -nk 2,2 file.dat | tac
1 6 7
1 4 5
2 3 5
5 2 1
1 2 3
$ sort -nrk 2,2 file.dat
1 6 7
1 4 5
2 3 5
5 2 1
1 2 3
tac - concatenate and print files in reverse
tac - 反向连接和打印文件
