From mboxrd@z Thu Jan 1 00:00:00 1970 Return-Path: X-Spam-Checker-Version: SpamAssassin 3.4.2 (2018-09-13) on inbox.vuxu.org X-Spam-Level: X-Spam-Status: No, score=-1.0 required=5.0 tests=DKIM_SIGNED,DKIM_VALID, MAILING_LIST_MULTI,RCVD_IN_DNSWL_NONE autolearn=ham autolearn_force=no version=3.4.2 Received: from primenet.com.au (ns1.primenet.com.au [203.24.36.2]) by inbox.vuxu.org (OpenSMTPD) with ESMTP id d7022711 for ; Thu, 5 Sep 2019 18:23:52 +0000 (UTC) Received: (qmail 3028 invoked by alias); 5 Sep 2019 18:23:44 -0000 Mailing-List: contact zsh-workers-help@zsh.org; run by ezmlm Precedence: bulk X-No-Archive: yes List-Id: Zsh Workers List List-Post: List-Help: List-Unsubscribe: X-Seq: 44730 Received: (qmail 4281 invoked by uid 1010); 5 Sep 2019 18:23:43 -0000 X-Qmail-Scanner-Diagnostics: from mail-lf1-f43.google.com by f.primenet.com.au (envelope-from , uid 7791) with qmail-scanner-2.11 (clamdscan: 0.101.2/25559. spamassassin: 3.4.2. Clear:RC:0(209.85.167.43):SA:0(-1.9/5.0):. Processed in 2.587361 secs); 05 Sep 2019 18:23:43 -0000 X-Envelope-From: schaefer@brasslantern.com X-Qmail-Scanner-Mime-Attachments: | X-Qmail-Scanner-Zip-Files: | Received-SPF: pass (ns1.primenet.com.au: SPF record at _netblocks.google.com designates 209.85.167.43 as permitted sender) DKIM-Signature: v=1; a=rsa-sha256; c=relaxed/relaxed; d=brasslantern-com.20150623.gappssmtp.com; s=20150623; h=mime-version:references:in-reply-to:from:date:message-id:subject:to :cc; bh=j6UoP56tm00G9DX6ULKf4oKLIkJNjSZ2qAcSbd9IQSI=; b=v6lAMeWrUEL3ZFGUC8AI35sSDtbyfbbHseBWS7lQqwowbouFAgN7Tbyj6IrwwdaVvZ RF+vLO0jci7ESF2KThvrzE9F3UZM7IZEEuNGMKB6Qslk7JUgocjl+qIOKkBxxGpHZIzq 3kE8piXH1VMRIA+8WNrpVRJQKOHEiOC9ohskaKoCtel42dPhK4qbFR16gddiqbDwqlf0 6ZMiIBkA7lAlWh1FS2F9WJB3PhEgXRDoQWb+WWlPy48V299y8CbS3iIhu+IBBD5A4WWB pKdiK5cjIns0jpALOX/cu4ZXT2aur0rRD52ent7ifEuG880m8SOoncSjY8bAMW4ZiFqu tFBQ== X-Google-DKIM-Signature: v=1; a=rsa-sha256; c=relaxed/relaxed; d=1e100.net; s=20161025; h=x-gm-message-state:mime-version:references:in-reply-to:from:date :message-id:subject:to:cc; bh=j6UoP56tm00G9DX6ULKf4oKLIkJNjSZ2qAcSbd9IQSI=; b=nopqpAF9ZF76spGReC/J1FbV9xaqvsC50TvRoUMzQZshfHtTn4ogvTiMr7WaB2iWmd HoI8lXoM+RKlBKh5YFA3MLXOBgaQhYCKSHcEMDVpdDUUjxHHpJTsvwFdf7lU48BcPtUf Qu+0YwRroBJNUZSLDITqI/qtwOL6Q5uyyPQZDL9mVKry68EaEBVgZHtHWm8mHfnrU21s aY/ldnBj8MdyG5BTveOnMwX0KGnh74JVS9kbcQ5pRbWNWQqIF+RRRQcCboXfXYSwS7E9 d+GkTT+v4ZPmCvozaazUta1U2PzHepeSHP5gCkBW2ax3zQ1m5kf/gQZDDKcd7+zOamsA M2Ug== X-Gm-Message-State: APjAAAVhPEmAcoT9wHnG4WV3ScBrsrvvShDhJjnInFWCdp6wc5FWUu9e 6qqU0JVa0+Br51boVIwijwbQ2RjTNYKoMyxI87/oTA== X-Google-Smtp-Source: APXvYqy0U/C0++YZvPYvHJCSq79dHq6gTE9JfKsgyzsZ0KxH9refPr+nxxHND4fY9AsUmta+2W4EpA84OaDPAhsSg+E= X-Received: by 2002:ac2:4c9c:: with SMTP id d28mr3293764lfl.119.1567707785237; Thu, 05 Sep 2019 11:23:05 -0700 (PDT) MIME-Version: 1.0 References: <69f3c9f0-b91b-beb1-d36c-854bb4eb3ff3@iij.ad.jp> In-Reply-To: <69f3c9f0-b91b-beb1-d36c-854bb4eb3ff3@iij.ad.jp> From: Bart Schaefer Date: Thu, 5 Sep 2019 11:22:53 -0700 Message-ID: Subject: Re: arithmetic expression from outside To: YAMAGUCHI Takanori Cc: "zsh-workers@zsh.org" Content-Type: text/plain; charset="UTF-8" On Thu, Sep 5, 2019 at 1:50 AM YAMAGUCHI Takanori wrote: > > Is this an intended behaviour? It's the way evaluation of variables in math expressions is defined, yes. Similarly in ksh: % echo 'sum[$(echo Hello, world!>&2)]' | ksh -c 'read n; echo $((n)) Hello, world! ksh: sum: parameter not set Also environment variables: % N='sum[$(echo Hello, world!>&2)]' ksh -c 'echo $((N))' Hello, world! ksh: sum: parameter not set (I have a 2012 ksh so maybe this is different now.) Bash 3.2.57 does the same, although without complaining about the unset parameter: % N='sum[$(echo Hello, world!>&2)]' bash -c 'echo $((N))' Hello, world! 0 Zsh at least does not do that with parameters from the environment, although I'm not exactly sure what prevents it.