From: "Bart Schaefer" <schaefer@candle.brasslantern.com>
To: Zoltan Hidvegi <hzoli@cs.elte.hu>, zsh-workers@math.gatech.edu
Cc: pws@ifh.de
Subject: Re: Bug Report: Env Vars and shell functions
Date: Fri, 12 Jul 1996 10:18:00 -0700 [thread overview]
Message-ID: <960712101804.ZM15374@candle.brasslantern.com> (raw)
In-Reply-To: Zoltan Hidvegi <hzoli@cs.elte.hu> "Re: Bug Report: Env Vars and shell functions" (Jul 12, 5:27pm)
On Jul 12, 5:27pm, Zoltan Hidvegi wrote:
} Subject: Re: Bug Report: Env Vars and shell functions
}
} > On a related note, should the following not restore IFS?
} >
} > sun4% IFS=@ set a@b@c@d; echo $IFS
} > @
}
} Here is what POSIX says:
}
} (2) Variable assignments specified with special built-in utilities
} shall remain in effect after the built-in completes; this shall
} not be the case with a regular built-in or other utility.
}
} And it also says that shell functions should be handled similarily to
} special builtins (which means that recent patches from Peter and me make
} zsh less conformant).
But more intuitive. I suspect POSIX was merely codifying existing sh/ksh
behavior there.
} Zsh currently treats a builtin this way
Clarity: Zsh treats a builtin the way it treats a shell function ...
} only if the BINF_MAGICEQUALS flag
} is set for the builtin. These builtins are: alias, declare, hash, integer,
} local, readonly and typeset.
[...]
} Of course zsh does not conforms to the POSIX rule and handling of special
} parameters in undoubtadly not the best but it also means that applications
} should not expect local variable assignments before special builtins since
} it may change in the future.
Hopefully it would merely become dependent on a POSIX-compliance option;
the whole reason for introducing the BINF_MAGICEQUALS behavior was so
that applications could expect these local variable assignments.
} Also note that command arguments are evaluated before variable assignments
} so the above example will never work.
Has this always been the case? (Peter?) Is this correct according to
POSIX? Of what use is the BINF_MAGICEQUALS behavior if the args are
evaluated before the variable gets assigned?
} In a POSIX shell the command builtin can be used to execute special
} builtins (in zsh it executes external command only). Note that command in
} not listed among the special builtins above which means that the special
} assignment behaviour can be prevented by prefixing a special builtin with
} the command builtin (I'm talking about POSIX and not about zsh).
Hmm. So `command typeset foo=bar ; echo $foo' has what effect in POSIX?
} I'm writing these because these differences between zsh and POSIX are
} probably the most important ones.
Perhaps that means they should be recorded somewhere, maybe Etc/BUGS or
a new file? (Where's the wish-list/ToDo-list nowadays?)
--
Bart Schaefer Brass Lantern Enterprises
http://www.well.com/user/barts http://www.nbn.com/people/lantern
New male in /home/schaefer:
>N 2 Justin William Schaefer Sat May 11 03:43 53/4040 "Happy Birthday"
next prev parent reply other threads:[~1996-07-12 17:28 UTC|newest]
Thread overview: 12+ messages / expand[flat|nested] mbox.gz Atom feed top
1996-07-08 3:49 Peter Bray
1996-07-08 8:58 ` Bart Schaefer
1996-07-08 12:49 ` Peter Stephenson
1996-07-10 2:33 ` Zoltan Hidvegi
1996-07-10 12:19 ` Vinnie Shelton
1996-07-10 13:45 ` Zoltan Hidvegi
1996-07-11 22:11 ` Anthony Heading
1996-07-12 12:17 ` Peter Stephenson
1996-07-12 15:27 ` Zoltan Hidvegi
1996-07-12 16:01 ` Anthony Heading
1996-07-12 17:18 ` Bart Schaefer [this message]
1996-07-12 17:43 ` Zoltan Hidvegi
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