--batch: mention how to write to stdout

--batch: mention how to write to stdout

[Dan Jacobson]

In info we note
`--batch'
     Run Emacs in "batch mode", which means that the text being edited
     is not displayed and the standard terminal interrupt characters
     such as `C-z' and `C-c' continue to have their normal effect.
     Emacs in batch mode outputs to `stderr' only what would normally

stderr is mentioned

     be displayed in the echo area under program control, and functions
     which would normally read from the minibuffer take their input
     from `stdin'.

stdin is mentioned

But stdout is not mentioned, so users can't figure out how to use it,
and end up using e.g.,
emacs -batch -eval '(progn(bbdb "." t)(other-window 1)(write-file "/dev/stdout"))'

Re: --batch: mention how to write to stdout

[Thien-Thi Nguyen]

Dan Jacobson <jidanni@jidanni.org> writes:

> (write-file "/dev/stdout")

$ emacs -batch -eval '(message "foo")' 2>&1 | wc
    1    1    4

thi

Re: --batch: mention how to write to stdout

[Dan Jacobson]

>>>>> "T" == Thien-Thi Nguyen <ttn@gnu.org> writes:
T> $ emacs -batch -eval '(message "foo")' 2>&1 | wc
T>     1    1    4
$  emacs -batch -eval '(message "foo")' 2>&1 | wc
     34     102    1227
I said stdout, not stderr, dangnabbit.  The user wants to read how
to e.g., send the current buffer to stdout.