bug#23590: 25.0.94; Errors in default lgrep command

[Eli Zaretskii]

> From: John Mastro <john.b.mastro@gmail.com>
> Date: Sat, 23 Jul 2016 09:57:02 -0700
> Cc: Eli Zaretskii <eliz@gnu.org>, Alex <agrambot@gmail.com>
> 
> Eli Zaretskii <eliz@gnu.org> wrote:
> > Shell commands that Emacs emits support /bin/sh and compatible
> > shells.  Zsh's default treatment of unmatched wildcards isn't.
> >
> > I don't know how it happened that lgrep invokes zsh on OP's system,
> > but if that is due to user customizations, they should be corrected.
> > If that is Emacs's fault (i.e. Emacs invokes zsh without any
> > customizations), it should be fixed.
> 
> Emacs invokes whichever shell is the value of the user's SHELL
> environment variable.

Then maybe we should change that.