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Re: Piping output from sqlplus
- From: Christopher Faylor <cgf-no-personal-reply-please at cygwin dot com>
- To: cygwin at cygwin dot com
- Date: Thu, 16 Dec 2004 15:40:05 -0500
- Subject: Re: Piping output from sqlplus
- References: <firstname.lastname@example.org>
- Reply-to: cygwin at cygwin dot com
On Thu, Dec 16, 2004 at 03:29:16PM -0500, Chuck wrote:
>I'm having a strange problem reading the output from sqlplus in Cygwin.
>Sqlplus is a windows command line program used to access oracle
>databases. My command looks something like this...
>sqlplus -s <<! | read line
>set pagesize 0 linesize 200 feedback off tab off
>This should output one line to stdout with the two values separated by a
>tab character. The read command should read it into the variable $line.
>On my Solaris system it works perfectly. In Cygwin, $line is empty.
Just to demonstrate what you're seeing without the sqlplus requirement:
bash$ echo hello | read line
bash$ echo $line
The reason for the behavior is apparently that when you use read in a
pipe like this bash and ash fork a separate process so the variable only
exists very briefly in that process and `line' is never defined in the
zsh does what you'd expect, so if you can use zsh instead of bash, that
would be a solution. Otherwise, you probably will have to experiment
with setting IFS and using either $(sqlplus) or `sqlplus` .
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