Re: [clisp-list] How to suppress / redirect standard error?

[John K. H. <hi...@al...>]

   >   ((in (ext:run-shell-command (format nil "~S ~{ \'~S\'~} 2>&1"

Note that when Lisp is launching the command it needs to use a shell
that understands the "2>&1" syntax.  So /bin/csh and /bin/tcsh will
NOT work.  The shell used can probably be ensured by setting
environment varialbe SHELL to /bin/sh or un-setting it.

There's no ambiguity w/ the wrapper script as the shell is set
explitly with the first "#!/bin/sh" line which says what interpereter
to use to run the script.

I agree w/ all of what Randall Schultz said too.  More important than
the "exec" (forking's pretty cheap these days) is the use of the
syntax to prevent un-escaping of the shell arguments.

 > 1) wouldn't it be nice to have an :ERROR-STREAM keyword arg ala :INPUT
 >    and :OUTPUT? (Sam, if you don't have objections i'd be happy to
 >    take a whack at this.)

the right way.  If the underlying O/S has a two-output-stream model,
and the point of the call is to interface to the underlying O/S
program exec facility, both streams should be accessible explicitly.

Things get even worse when you start opening command pipes and want to
route their separate output/error streams to different places using
only the shell redirection syntax ...

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John Hinsdale, Alma Mater Software, Inc., Tarrytown, NY 10591-3710 USA
hi...@al... | http://www.alma.com/staff/hin | +1 914 631 4690