Shell -删除重复的段落

Question

我有一个.sh文件，里面有很多重复的释义。现在我需要删除这些重复项，只保留一个

例如

**startkeyword**
  today is good
  how are you
  apple
**endKeyword**
**startkeyword**
  today is good
  how are you
  apple
**endKeyword**
**startkeyword**
 do you like apple
 I like apple
**endKeyword**
**startkeyword**
  today is good
  how are you
**endKeyword**
**startkeyword**
  today is good
  how are you
  apple
**endKeyword**

结果应该是:

**startkeyword**
  today is good
  how are you
  apple
**endKeyword**
**startkeyword**
 do you like apple
 I like apple
**endKeyword**
**startkeyword**
  today is good
  how are you
**endKeyword**

我如何在。sh文件中做?可以自由使用sed、awk或tr

Answer 1

如果你不介意去掉星号**

awk -v RS='[*][*]n[*][*]' '{gsub(/[*]|n$/,""); if(!visited[$0]++) print $0}' file

输出

startkeyword
  today is good
  how are you
  apple
endKeyword
startkeyword
 do you like apple
 I like apple
endKeyword
startkeyword
  today is good
  how are you
endKeyword