newlispfanclub.alh.net

Posted: **Tue Nov 02, 2004 11:01 pm**

Is there an easy way to capture the stdout (and stderr) output
of an external command run using (!) without using files?

I'd like to be able to do something like:

(set 'file04 (! "ls -l | grep 2004"))

and have the result be the string spit out by
grep instead of the return code as (!) does now.

Perhaps the set of $ variables could be extended
to include a $stdout and $stderr such that after
running the above $stdout would contain the output
of grep and $stderr would be nil.

Another approach would be to redefine (!) to return
a list containing the result code, stdout, and stderr
as in:

(! "echo 'abc' ") --> ( 0 "abc" nil).

Posted: **Wed Nov 03, 2004 12:25 am**

Instead of '!' use 'exec' it captures the standard out in a list line by line, i.e: on Solaris:

Code: Select all

Sun Microsystems Inc.   SunOS 5.8       Generic February 2000
~> newlisp
newLISP v.8.2.5 Copyright (c) 2004 Lutz Mueller. All rights reserved.

> (exec "ls /etc")
("TIMEZONE" "acct" "aliases" "aliases.dir" "aliases.pag" "ami" "apache"
 "asppp.cf" "auto_home" "auto_master" "autopush" "cfgadm" "chroot"
 ............
 "vfstab.orig" "vfstab.s1" "volcopy" "vold.conf" "wall" "whodo" "wtmpx")
>

There are many Unixs commands working well with 'exec' but try also
the function "process" which can redirect std I/O to pipes.

Lutz

Posted: **Wed Nov 03, 2004 12:35 am**

Thanks, Lutz.

It would be nice to have "see also (exec)"
in the manual entries for (!) and (process).

Posted: **Wed Nov 03, 2004 12:50 am**

I will add those references

Lutz

newlispfanclub.alh.net

How to capture output from (!) ?

How to capture output from (!) ?