The command "echo.hello world" emits the string "hello world" followed by a
CRLF sequence. There are at least a couple of situations where this fact is
a nuisance:

    - displaying a minimalist progress bar.
    - sending arbitrary character strings to a serial device.
    - writing strings from separate commands that need to appear in the same
line in an output file.

The command that does this is:

    <nul (set/p anyvariable=string to emit)

The "<nul" pipes a nul response to the set/p command, which will cause the
variable used to remain unchanged. As usual with set/p, the string to the
right of the equal sign is displayed as a prompt with no CRLF.

Here is an example where this is used for a rudimentary progress bar:

    @echo off
    for /l %%A in (1,1,20) do (
        <nul (set/p z=%%A)
        >nul ping 127.0.0.1 -n 2
    )

And here is an example where info is written to a single line in a file from
multiple uses of the set/p command:

    <nul (set/p z=hello) >out.txt
    <nul (set/p z= world!) >>out.txt
    dir out.txt

The dir command should indicate the file size as 12 bytes: "hello world!".

The strings output need not be literal, and can originate from any source
capable of creating a variable, simply by including a variable reference in
the prompt string:

    <nul (set/p z=sec min hours: %time:~6,2% %time:~3,2% %time:~0,2%)