Check out example codes for "bin/bash bad interpreter". It will help you in understanding the concepts better.
Code Example 1
#The ^M is a carriage return character. Linux uses the line feed character to mark the end of a line, whereas Windows uses the two-character sequence CR LF. Your file has Windows line endings, which is confusing Linux. #remove the cariage character sed -i -e 's/\r$//' NAME-OF-FILE.sh
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