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From: Bart Schaefer <schaefer@brasslantern.com>
To: Peng Yu <pengyu.ut@gmail.com>
Cc: zsh-users <zsh-users@zsh.org>
Subject: Re: The best way to know it is in zsh or bash
Date: Fri, 6 Sep 2019 10:41:48 -0700
Message-ID: <CAH+w=7aAW+QSof==zCYSRQ-5-qJAThZeYPMgFPDk1EWzuXz+dQ@mail.gmail.com> (raw)
In-Reply-To: <CABrM6w=5V8VnJcX0SNj0s8+EpyJWFqN7EYTYc51rNpTYQ_p9vw@mail.gmail.com>

On Fri, Sep 6, 2019 at 7:42 AM Peng Yu <pengyu.ut@gmail.com> wrote:
>
> Suppose that I start with bash default login shell, then I call zsh.
>
> I'd like to determine whether I am in bash or zsh.

Where/when is it that you want to do this?  The two shells have an
entirely distinct set of startup files (except that many packaged
distributions have /etc/zshrc loading /etc/bashrc or similar) so I
take it that it's sometime after that?

> I see ZSH_*
> environment variables. Is ZSH_VERSION the most appropriate to be used
> to test whether it is in zsh or not?

The ZSH_* variables are normally global shell parameters, not exported
to the environment.  If something is exporting them, it probably
should not be.

ZSH_VERSION is the oldest of these (if you are worried about
differences within zsh itself), so it should be OK to examine.  See
Mikael's answer.

  parent reply index

Thread overview: 7+ messages / expand[flat|nested]  mbox.gz  Atom feed  top
2019-09-06 14:41 Peng Yu
2019-09-06 15:11 ` René Wilhelm
2019-09-06 15:38   ` Peng Yu
2019-09-06 15:51     ` gi1242+zsh
2019-09-06 15:16 ` Mikael Magnusson
2019-09-06 17:41 ` Bart Schaefer [this message]
     [not found] <CABrM6w=5V8VnJcX0SNj0s8+EpyJWFqN7EYTYc51rNpTYQ_p9vw__33715.8397933067$1567780959$gmane$org@mail.gmail.com>
2019-09-06 19:02 ` Stephane Chazelas

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