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Re: problem with command block I/O redirection...


From: Paul Jarc
Subject: Re: problem with command block I/O redirection...
Date: Mon, 27 Aug 2001 17:16:53 -0400
User-agent: Gnus/5.090004 (Oort Gnus v0.04) Emacs/20.7

"Perry Dykes" <address@hidden> wrote:
> When I use a command block w/ I/O redirection include a pipe, I get
> different results and variables do not scope correctly.

Each element of a pipeline is run in a separate process.  So variable
settings, etc., will not be visible except within that same pipeline
element.  This is related to FAQ entry E4.

> retvalue=1
> {
...
> retvalue=$?
> } 2>&1 | tee outfile.txt 2>&1   (Line a)

Move the code that uses retvalue inside the { } pipeline element:
exec 3>&1
{
 ...
 echo "$retvalue" >&3
} | tee outfile.txt

Or try this (won't work for some other sh interpreters):
exec 3>&1 4>&2 > >(tee outfile.txt) 2>&1 # save stdout & stderr, then redirect
retvalue=1
...
exec 1>&3 2>&3 # restore stdout & stderr


paul



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