主页 / unix / 问题 / 704819
Accepted
Edman
Asked: 2022-06-03 18:37:47 +0800 CST

替换 ed 中第二次出现的单词/短语

  • 772

仅替换 ed 中第二次/第三次出现的单词/短语的语法是什么？

He wanted to buy groceries from the shop, but preferred not having to go into the shop. >>
He wanted to buy groceries from the shop, but preferred not having to go into it. >>
ed

1 个回答

  1. Best Answer

    ed,中的替换命令在s///命令字符串的末尾采用零个或多个标志。如果标志包含正整数n，则替换将作用于第n次匹配。

    假设您想the shop用 string 替换当前行上第二次出现的 substring it，因此您将使用

    s/the shop/it/2

    来自编辑会话的快照可能如下所示，其中用户查看当前行，p然后决定对第二次出现的 进行更改，the shop在编辑后再次显示该行（使用命令的标志p ）s///：

    p
He wanted to buy groceries from the shop, but preferred not having to go into the shop.
s/the shop/it/2p
He wanted to buy groceries from the shop, but preferred not having to go into it.

    s///编辑命令的这一特性由sed.

    • 2

相关问题