Re: What shells fail to work if comparing with "" ?

[Bob Friesenhahn]

On Thu, 10 Feb 2011, Stefano Lattarini wrote:
> > but someone has argued against this, saying he knows of no shell where the
> > former is not acceptable. I realise this issue is probably more of a problem
> > with older shells,
> Solaris 10 /bin/sh is not really old.

I do see the issues you mention with recently-patched /bin/sh on 
Solaris 10.  However, /usr/xpg4/bin/sh passes your tests with flying 
colors on Solaris 10.  The description of /usr/xpg4/bin/sh is 
considerably different than /bin/sh:

    "The /usr/bin/sh utility is a  command  programming  language
     that executes commands read from a terminal or a file."

    "The /usr/xpg4/bin/sh utility is a standards compliant shell.
     This  utility  provides  all  the  functionality  of ksh(1),
     except in cases discussed in  ksh(1)  where  differences  in
     behavior exist."

Interestingly, on Solaris 10, /bin/sh is a link to /sbin/sh, implying 
that it is intended for purposes like system initialization scripts.

Bob
--
Bob Friesenhahn
address@hidden, http://www.simplesystems.org/users/bfriesen/
GraphicsMagick Maintainer,    http://www.GraphicsMagick.org/