This error is caused by the different coding of windows system and Linux system. The carriage return in windows is , while that in Linux is , so carriage return in scripts written remotely with shell is not recognized by Linux system, but it can not be seen when editing with vim.
Solution: add - B , that is, VIM - B file name , when editing the script file with VIM, so that the open file is "binary mode", you can see the extra things, and the display is ^ m , delete it, save it and run it.