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Mon, 12 Apr 2021 13:42:09 -0700 (PDT) MIME-Version: 1.0 References: <7FD930F4-37CD-402B-9A06-893818856199@dana.is> <20210411175726.hxnm33mxoska2tsm@chazelas.org> <20210411193154.zkekzvb4o6xmriwo@chazelas.org> In-Reply-To: <20210411193154.zkekzvb4o6xmriwo@chazelas.org> From: Bart Schaefer Date: Mon, 12 Apr 2021 13:41:58 -0700 Message-ID: Subject: Re: sh emulation POSIX non-conformances ("inf"/"Inf" in arithmetic expressions) To: Zsh hackers list Content-Type: text/plain; charset="UTF-8" X-Seq: 48514 Archived-At: X-Loop: zsh-workers@zsh.org Errors-To: zsh-workers-owner@zsh.org Precedence: list Precedence: bulk Sender: zsh-workers-request@zsh.org X-no-archive: yes List-Id: List-Help: List-Subscribe: List-Unsubscribe: List-Post: List-Owner: List-Archive: On Sun, Apr 11, 2021 at 12:32 PM Stephane Chazelas wrote: > > $ zsh --emulate sh -c 'inf=42; echo $((inf))' > Inf > > (POSIX requires 42 there). Is that because "Inf" is case-sensitive, or because POSIX requires evaluating the variable? E.g. what does sh -c 'Inf=42; echo $((Inf))' yield in POSIX? What about sh -c 'unset Inf; echo $((Inf))' sh -c 'unset inf; echo $((inf))' ?? I don't have a POSIX shell to test with, it seems. Ksh "Version A 2020.0.0" responds the same as zsh, and bash "5.0.17(1)-release" doesn't seem to have Inf at all (and gives a syntax error on floating-point arithmetic?).