Executes an Ex command. On execution error: fails with VimL error, updates v:errmsg. Prefer using |nvim_cmd()| or |nvim_exec()| over this. To evaluate multiple lines of Vim script or an Ex command directly, use |nvim_exec()|. To construct an Ex command using a structured format and then execute it, use |nvim_cmd()|. To modify an Ex command before evaluating it, use |nvim_parse_cmd()| in conjunction with |nvim_cmd()|. Parameters: ~ {command} Ex command string