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Date: Fri, 30 Dec 2011 06:06:09 +0000
From: Dave Korn <dave DOT korn DOT cygwin AT gmail DOT com>
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Subject: Re: SHELLOPTS=igncr and bash --posix
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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!)

> If so, is a fix possible?

  Use "set -o igncr" instead.

    cheers,
      DaveK



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