Re: request for review: Doing direct file I/O in Emacs Lisp

[Richard Stallman <rms@gnu.org>]

    > When eshell sees a redirect from a builtin, I think it would be most
    > efficient to produce the output in a buffer and write it with
    > write-region into the file.

    What about "ls foo | grep bla"?  Then the output isn't a file.

Then you could put the ls output in a buffer and feed it to grep.
That would work fine.

    That would be an interesting feature.  But I think there is also the
    need to send output from a process to a Lisp command, and to send
    output from a Lisp command to a process.  This way, one can do:

	shell_command | lisp_builtin | shell_command_2

You can do this with the existing facilities of start-process.