Resolve "/bin/bash^m:bad interpreter:no such file or directory"

The main reason for this error when executing shell scripts is that the shell script file is in DOS format, that is, the end of each line is identified by \ r \ n, and the end of the file line in UNIX format is identified by \ n.
There are several ways to see if the script file is in DOS or UNIX format.
(1) cat-a filename from the display results can be judged that the DOS format of the file line tail for the ^m$,unix format of the file line end is $.
(2) od-t x1 filename If you see 0d 0a characters in the output, the file is in DOS format, and if only 0a is the UNIX format.
(3) VI filename Open file, execute: Set FF, if the file is in DOS format shown as Fileformat=dos, if Unxi is displayed as Fileformat=unix.

Workaround:
(1) using the Linux command Dos2unix filename to convert files directly to UNIX format
(2) Use the SED command sed-i "s/\r//" filename or sed-i "s/^m//" filename to replace the end character directly with the UNIX format
(3) VI filename Open file, execute: Set Ff=unix set file for Unix, then execute: WQ, save to UNIX format.

Resolve "/bin/bash^m:bad interpreter:no such file or directory"