Question

shell如何修改某行某列的值

我有一个文件，里面内容如下;
00 00 00 00 00 00 00 00 05 00 00 00 05 00 00 00
05 00 00 00 05 00 00 00 01 00 00 00 01 00 00 00
01 00 00 00 01 00 00 00 01 00 00 00 01 00 00 00
01 00 00 00 01 00 00 00 01 00 00 00 01 00 00 00
01 00 00 00 01 00 00 00 01 00 00 00 01 00 00 00
01 00 00 00 01 00 00 00 05 00 00 00 05 00 00 00
05 00 00 00 05 00 00 00 05 00 00 00 05 00 00 00
05 00 00 00 05 00 00 00 00 00 00 00 01 02 00 00
01 02 00 00 01 02 00 00 01 02 00 00 00 00 00 00
01 01 1c 05 00 00 00 00 01 00 45 08 01 00 36 04
01 00 32 00 00 00 00 00 01 00 00 b1 01 00 00 60
01 00 01 45 01 00 04 a7 00 00 00 00 01 00 fe 00
00 00 00 00 01 00 00 00 00 00 00 00 01 00 00 00
我想对里面第x行，第y列的数据修改。该怎么写？

Answer 1

可以用Vim打开文件, 定位之后编辑

如果不想使用屏幕编辑器,可以考虑行编辑器 sed 或者 awk

比如要改第二行第四列的05为06
用awk的话可以
awk 'NR==2 {$4="06"}' myfile > mynewfile 即可
NR==2 表示如果是第二行, $4表示第四项, $4="06" 就改成06了

追问

我试了这样改不了啊

追答

忘了输出了,呵呵

awk 'NR==2 {$4="06"}{print}' myfile > mynewfile

Answer 2

首先你得确认这个是二进制文件还是文本文件，
如果是普通文本文件，那么如楼上所说用awk是最简单的。
如果是二进制文件，用dd修改。

追问

改不了

追答

少了条print语句。

awk 'NR==2{$4="06"}{print}' myfile >newfile