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Message-ID: <3AFAF02C.545770B1@veritas.com>
Date: Thu, 10 May 2001 12:46:52 -0700
From: Bob McGowan <rmcgowan AT veritas DOT com>
Organization: VERITAS Software
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To: JROZYCKI AT ebmail DOT gdeb DOT com
CC: cygwin AT cygwin DOT com
Subject: Re: Question about the 'read' command in bash
References: <85256A48 DOT 006A6FF5 DOT 00 AT ebmail DOT gdeb DOT com>
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ksh is not bash (nor is it pdksh).  ksh manages to do several things in the
current shell, while bash and pdksh handle it in a sub-process.  Variables in a
sub-process cannot affect the environment of the parent.

The solution is to use substitution:

  op_sys=$(uname | cut -c1-4)

and use the value.  I'd suggest that this is the more portable and probably the
preferred way of doing this.

JROZYCKI AT ebmail DOT gdeb DOT com wrote:
> 
> I have a bash shell script with the following lines of code:
> 
> #!/bin/bash
> uname | cut -c1-4 | read op_sys
> echo $op_sys
> 
> This works fine at work using SGI IRIX and ksh, but under cygwin and bash
> at home, op_sys does not get set - null is echoed.. what do I need to do
> differently?
> 
> thanks,
> Jeff
> 
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-- 
Bob McGowan
Staff Development Engineer
VERITAS Software
rmcgowan AT veritas DOT com

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