What Does ^m In Vim Mean And What Will It Possible Affect

There's a problem occurring to me when executing BigQuery load data operation, a seem-to-be one-line string in Vim is actually treated as multiple lines when I examining into the error log.

After opening this file in Vim, we could see that there're several ^m marks in the string (if it's not visible, invoke `:set list` command). According to Vim's digraph table, this is the representation of CARRIAGE RETURN (CR).

A specific sum-up for \r and \n is as follows:

    \r = CR (Carriage Return) // Used as a new line character in Mac OS before X
    \n = LF (Line Feed) // Used as a new line character in Unix/Mac OS X
    \r\n = CR + LF // Used as a new line character in Windows

Consequently, we should merely use \n as the new-line-character since almost all server are Unix-based, thus omitting \r when programming.

The way to replace \r\n with \n in Vim is to execute `:%s/\r//g`, whereas in CLI, we could apply `cat original_file | tr -d '\r' > remove_cr_file` to achieve the same effect.