Re: Bug report + feature request

Re: Bug report + feature request

[Sven Wischnowsky]

Sullivan N. Beck wrote:

> ...
> 
> Now for the feature request.  Since I'd actually like to separate and
> pipe STDOUT and STDERR separately to different commands (all of the
> above came about from various attempts to get this working) without
> resorting to fifos, intermediate files, etc., what I'd _really_ like to
> do is to be able to pipe different file descriptors similar to how I can
> redirect them to a file.  For example, I'd like to replace the following
> lines:
> 
>   COMMAND > /tmp/stdout 2> /tmp/stderr
>   cat /tmp/stderr | STDERR_COMMAND
>   cat /tmp/stdout | STDOUT_COMMAND
> 
> with the single line:
> 
>   COMMAND >| STDOUT_COMMAND 2>| STDERR_COMMAND
> 
> If this syntax isn't acceptable, that's fine with me.  Any syntax is
> fine.  I'd just like the functionality.

How should it find out if, in your example, STDERR_COMMAND should be
used for COMMAND or STDOUT_COMMAND?

But anyway... have you seen the >>(cmd) process substitution?
You can do:

  COMMAND >>(STDOUT_COMMAND) 2>>(STDERR_COMMAND)

or

  COMAMND 2>>(STDERR_COMMAND) | STDOUT_COMMAND

if you prefer.


Note to workers: in the info file, >>(foo) is shown as `> >(foo)'. Urgh.


Bye
 Sven


--
Sven Wischnowsky                         wischnow@informatik.hu-berlin.de

Process substitution

[Bart Schaefer]

On Oct 6, 10:24am, Sven Wischnowsky wrote:
}
} Note to workers: in the info file, >>(foo) is shown as `> >(foo)'. Urgh.

That -is- the way it's parsed.  It works just fine to write it that way.

The nice thing would be if there were a way to wait for those jobs to
complete.  They run in the background (as they must, really) but they're
not entered into the job table.

BTW, it's fairly easy to get zsh to forget to delete a file created with
=(...).  Compare:

	cat <<<'bar' =(echo foo)		# temp file removed
	echo bar >> =(echo foo)			# temp file removed
	cat <<<'bar' >> =(echo foo)		# temp file remains

-- 
Bart Schaefer                                 Brass Lantern Enterprises
http://www.well.com/user/barts              http://www.brasslantern.com

Zsh: http://www.zsh.org | PHPerl Project: http://phperl.sourceforge.net