From: Paul Melis <paul@...>
Date: 2002-12-01T00:58:55+09:00
Subject: Re: catch stderr

"Shannon Fang" <xrfang@hotmail.com> wrote in message
news:20021129220610.990B.XRFANG@hotmail.com...
> Hi,
>
> I have some question about catching stderr output in ruby... Please read
> the following simple code.
>
> STDERR.reopen STDOUT
> result=`net use abc`
> print "res=", result
>
> while abc is not available on my LAN. I didn't succeed in catch the
> stderr output to my program.

Since you seem to be on windows, perhaps that is screwing up the redirect
stuff. Windows is not very good at the unix ways of I/O streams.

One way of capturing stderr (or actually redirecting) is using the "redir"
utility included in DJGPP (included in
ftp://ftp.simtel.net/pub/simtelnet/gnu/djgpp/v2/djdev203.zip).
It allows you to redirect stderr to stdout (or a file), so you can do

irb(main):001:0> res = `redir -eo net use abc`
"System error 67 has occurred.\n\nThe network name cannot be found.\n\n"
irb(main):002:0> res
"System error 67 has occurred.\n\nThe network name cannot be found.\n\n"

Good luck,
Paul