Re: [Help-bash] Using single quotes to escape a newline

[Greg Wooledge]

On Wed, Jul 29, 2015 at 05:28:56PM -0700, Michael Convey wrote:
> Are you saying that when echo sends its output to stdout, and only when
> stdout is the terminal, the kernel converts the <newline> to \r\n?

There's nothing special about echo in this situation.  The same thing
happens when ANY program writes data to a terminal, and the terminal is
in the correct mode.

The behavior of a terminal (driver) is controlled by various flags that
a shell program can read or set using stty(1).  stty calls this particular
flag "onlcr" (Output NewLine => CarriageReturn).

In the HP-UX manual:

      onlcr (-onlcr)           Map (do not map) newline character to a
                               carriage-return/newline character sequence on
                               output.

In the Debian manual:

       * [-]onlcr
              translate newline to carriage return-newline

> In \r\n
> does \r = <CR> (carriage return) and \n = <newline>????

Yes.