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List:       ast-users
Subject:    Re: [ast-users] code behavior change upgrading to ksh 93t+
From:       David Korn <dgk () research ! att ! com>
Date:       2011-05-31 2:53:46
Message-ID: 201105310253.p4V2rkZn025584 () penguin ! research ! att ! com
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cc: dan.rickhoff@comcast.net
Subject: Re: [ast-users] code behavior change upgrading to ksh 93t+
--------

> After upgrading ksh (from version "s"?), at least one of my scripts is misbehavi
> ng.  My system:
> 
> $ print ${.sh.version} 
> Version AJM 93t+ 2010-02-02 
> $ uname -srvpio 
> Linux 2.6.18-92.1.13.el5 #1 SMP Thu Sep 4 03:51:21 EDT 2008 x86_64 x86_64 GNU/Li
> nux
> 
> 
> The following exemplifies the behavior.
> 
> This works as expected:
> 
> $ sed 's/^/Hello /' <(print "Fred" | sort) 
> Hello Fred 
> 
> However, the following fails to capture the output of the above command in the v
> ariable "x", as it should. 
> 
> $ x="$(sed 's/^/Hello /' <(print "Fred" | sort))" 
> Fred 
> $ print "x: $x" 
> x: 
> 
> If I leave out the " | sort", then the output is (correctly) captured in the var
> iable "x".
> 
> $ x="$(sed 's/^/Hello /' <(print "Fred"))" 
> $ print $x 
> Hello Fred 
> 
> Is this a bug in ksh?
> 

This was a bug in ksh93t+ that was fixed for ksh93u.  You can pick up ksh93u
from the AST download site, http://www.research.att.com/sw/download/.
I will add this as a regression test so that it will not fail with a future
update.


David Korn
dgk@research.att.com
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