sed - How to find and replace all occurrences of a string recursively in a directory tree? -

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Using just grep and sed, how can I change all these events: 

 < Code> a. In a text file under    
 
  b.example.com  
 
 with  Directory tree is constantly being searched and replaced in all the files in the subdirectory of all the files.

try this: find / home / user / -type F | Xigs SAD- 'I / AEmplex / B.Amplex / G'


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