Terminal printing carriage return as ^M?? [linux telling me to stop coding?]

Question

I was writing a script in vim, dropped my keyboard, and continued coding.

I didn't notice that my cursor changed from the normal _ type cursor, to a [] block. (as if i hit insert in a windows terminal)
I started up my script, and got a /bin/bash^M: bad interpreter error.

With plenty of googling, ^M is the dos carriage return.. but when I hit enter in terminal it looks like a normal carriage return. But bash interprets it as ^M.

I practically keyboard slammed to see what on earth I hit to change this. can someone help me out here?

Answer 1

When you dropped your keyboard, not only did it hit the Insert key, but it managed to enter the :set tx command as well. Run the :set fileformat=unix command in the edit buffer for the file concerned, and then re-save the buffer.

Answer 2

To convert a file with CRLF line terminators to LF, run:

sed 's/\r$//' -i your-script-filename

If it's an issue in vim (and not your terminal), look at gVim showing carriage return (^M) even when file mode is explicitly DOS