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Re: mailcheck patch

X-seq: zsh-workers 1196
From: Zoltan Hidvegi <hzoli@xxxxxxxxxx>
To: aheading@xxxxxxxxxxxx (Anthony Heading)
Subject: Re: mailcheck patch
Date: Tue, 28 May 1996 00:00:46 +0200 (MET DST)
Cc: zsh-workers@xxxxxxxxxxxxxxx (Zsh workers list)
In-reply-to: <199605272004.VAA17880@xxxxxxxxxxxxxxxxxxxxxxxxxxx> from Anthony Heading at "May 27, 96 09:04:19 pm"
Organization: Dept. of Comp. Sci., Eotvos University, Budapest, Hungary
Phone: (36 1)2669833 ext: 2667, home phone: (36 1) 2752368

> Zoltan wrote:
> > I do not incorporate it now.  Instead here is an other patch.  After that,
> > the message part of mailpath will undergo parameter expansion, command
> > substitution and arithmetic substitution.  This is exactly what ksh does.
> > This can provide equivalent functionality to the requested feature.
> 
> Fine by me. Just to check, though, is it clear that $_ will never clash with
> its normal "special parameter" meaning?

During the substitution the $_ special parameter expands to the name of the
mail folder.  The old value of $_ is saved before the expansion and
restored afterwards.  In command substitutions only the first command can
use $_ this way but that is not a big limitation.  Command substitutions
are evaluated after a fork() and the change in $_ does not affect the
parent process.

Zoltan

References:
- Re: mailcheck patch
  - From: Anthony Heading

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