Error: /bin/bash^M: bad interpreter

How to fix below error?

[[email protected] /]# ./script test
 bash: ./script: /bin/bash^M: bad interpreter: No such file or directory

There nultiple way to fix this error, the problem is with the file format, you need to convert it to Unix format and your error should be gone.
You can fire the command below to fix.

[[email protected] /]# dos2unix filename

You can try steps below

 Open file, vi script
 then press ESC and enter :set fileformat=unix
 save file and try to run script again. 

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