示例数据文件 /tmp/file

1 This is line one
2 This is line two
3 This is line three
4 This is line four
5 This is line one
6 This is line two
7 This is line three
8 This is line four

示例2

将第8行的four替换为your text ，注意第4行也有four，但是我们只替换第8行的

# sed '8s/four/your text/g' /tmp/file

1 This is line one
2 This is line two
3 This is line three
4 This is line four
5 This is line one
6 This is line two
7 This is line three
8 This is line your text

示例1

将第5行的“one”替换为“your text”

# sed '5s/one/your text/g' /tmp/file

1 This is line one
2 This is line two
3 This is line three
4 This is line four
5 This is line your text
6 This is line two
7 This is line three
8 This is line four