使用sed替换文本文件中2行之间的文本

Question

Similar questions have been asked but they are for Powershell.

I have a Markdown file like:

.
.
.
## See also

- [a](./A.md)
- [A Child](./AChild.md)
.
.
.
- [b](./B.md)
.
.
.
## Introduction
.
.
.

I wish to replace all occurrences of .md) with .html) between ## See also and ## Introduction :

.
.
.
## See also

- [a](./A.html)
- [A Child](./AChild.html)
.
.
.
- [b](./B.html)
.
.
.
## Introduction
.
.
.

I tried like this in Bash

orig="\.md)"; new="\.html)"; sed "s~$orig~$new~" t.md -i

But, this replaces everywhere in the file. But I wish that the replacement happens only between ## See also and ## Introduction

Could you please suggest changes? I am using awk and sed as I am little familiar with those. I also know a little Python, is it recommended to do such scripting in Python (if it is too complicated for sed or awk)?

Answer 1

$ sed '/## See also/,/## Introduction/s/\.md/.html/g' file