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Date:	Fri, 30 Dec 2011 07:41:13 -0500
From:	Rafael Kitover <rkitover AT cpan DOT org>
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Subject:	Re: SHELLOPTS=igncr and bash --posix
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On 12/30/2011 1:06 AM, Dave Korn wrote:
> On 29/12/2011 21:40, Rafael Kitover wrote:
>> Some of my bash scripts, particularly ones that are #!/bin/bash --posix
>> trigger a nasty warning when I have SHELLOPTS=igncr set in my ~/.zshrc:
>>
>> rkitover AT eeebox ~/src/scala % echo $SHELLOPTS
>> igncr
>> rkitover AT eeebox ~/src/scala % bash --posix
>> bash: SHELLOPTS: readonly variable
>>
>> this is rather unsightly so I have turned off SHELLOPTS for now.
>>
>> Is this a bug? 
> 
>   Bug in your script I'm afraid.  SHELLOPTS is indeed a readonly variable, it
> can only be set outside bash before starting it, definitely not from within a
> startup script.  (Perhaps the reason it seems associated with --posix is
> because that selects different startup files?  I'm guessing that you may have
> ENV=~/.zshrc because it's not normal behaviour for bash to read zsh's startup
> file!)

I don't have ENV set.

If I comment out the SHELLOPTS setting in ~/.zshrc then do this the
problem still appears:

rkitover AT eeebox ~ % export SHELLOPTS=igncr
rkitover AT eeebox ~ % bash --posix
bash: SHELLOPTS: readonly variable
%{
%}(%n@%m)[%h] %{%}%~%{%}
$

I do not have a ~/.profile, and ~/.bash_profile just reads ~/.bashrc. I
do not set SHELLOPTS in ~/.bashrc, it only has set -o igncr.

> 
>> If so, is a fix possible?
> 
>   Use "set -o igncr" instead.

But if I want to use CRLF #/bin/sh scripts from zsh, then I have to set
SHELLOPTS.

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