如何在文件的特定行中更改字符 [英] How to change a character in a specific line of a file

问题描述

我有一个.bd文档，其中每行都有行.每本书都有标题，作者等，并以\t分隔.每行的最后一个字符可以是1或0，这取决于是否借用了这本书.我需要一种更改该数字的方法，以使用id(该行的第一个数字)更改一本书的状态.

I have a .bd document which has lines for each book that I have. Each book has the title, author, etc divided by a \t. The last character of each line can be 1 or 0 depending on whether the book is borrowed or not. I need a way to change that number change the state of a book by using the id (first number of the line).

1   title1  author1 genre1  year1   shelv1  0
2   title2  author2 genre2  year2   shelv2  0
3   title3  author3 genre3  year3   shelv3  0

推荐答案

要将ID 2的状态更改为1:

To change status of id 2 to 1:

awk -v id=2 -v status=1 'BEGIN{FS=OFS="\t"} $1==id {$NF=status}1' file

输出:

1       title1  author1 genre1  year1   shelv1  0
2       title2  author2 genre2  year2   shelv2  1
3       title3  author3 genre3  year3   shelv3  0

---

请参阅: 8个强大的Awk内置变量– FS，OFS，RS，ORS，NR，NF，文件名，FNR

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