Path: csiph.com!fu-berlin.de!usenet.stanford.edu!not-for-mail From: Chet Ramey Newsgroups: gnu.bash.bug Subject: Re: set -u not working as expected Date: Sun, 2 Aug 2020 16:41:32 -0400 Organization: ITS, Case Western Reserve University Lines: 17 Approved: bug-bash@gnu.org Message-ID: References: <000301d66834$588493c0$098dbb40$@kalvr.net> Reply-To: chet.ramey@case.edu NNTP-Posting-Host: lists.gnu.org Mime-Version: 1.0 Content-Type: text/plain; charset=utf-8 Content-Transfer-Encoding: 8bit X-Trace: usenet.stanford.edu 1596400901 7904 209.51.188.17 (2 Aug 2020 20:41:41 GMT) X-Complaints-To: action@cs.stanford.edu Cc: chet.ramey@case.edu, bug-bash@gnu.org To: =?UTF-8?Q?Lawrence_Vel=c3=a1zquez?= , Kristof Burek Envelope-to: bug-bash@gnu.org DKIM-Signature: v=1; a=rsa-sha256; c=relaxed/relaxed; d=case.edu; s=smtp-primary; t=1596400897; bh=zp5iuv50dLNoAuQkD8I5h4a/8/QskBNA9jdn2L5Y6E0=; h=Reply-To:Cc:Subject:To:References:From:Message-ID:Date: MIME-Version:In-Reply-To:Content-Type:Content-Transfer-Encoding; 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envelope-from=chet.ramey@case.edu; helo=mpv1-2015.case.edu X-detected-operating-system: by eggs.gnu.org: First seen = 2020/08/02 16:22:51 X-ACL-Warn: Detected OS = Linux 2.4.x-2.6.x [generic] X-Spam_score_int: -43 X-Spam_score: -4.4 X-Spam_bar: ---- X-Spam_report: (-4.4 / 5.0 requ) BAYES_00=-1.9, DKIM_SIGNED=0.1, DKIM_VALID=-0.1, DKIM_VALID_AU=-0.1, DKIM_VALID_EF=-0.1, RCVD_IN_DNSWL_MED=-2.3, SPF_HELO_NONE=0.001, SPF_PASS=-0.001, URIBL_BLOCKED=0.001 autolearn=ham autolearn_force=no X-Spam_action: no action X-BeenThere: bug-bash@gnu.org X-Mailman-Version: 2.1.23 Precedence: list List-Id: Bug reports for the GNU Bourne Again SHell List-Unsubscribe: , List-Archive: List-Post: List-Help: List-Subscribe: , X-Mailman-Original-Message-ID: X-Mailman-Original-References: <000301d66834$588493c0$098dbb40$@kalvr.net> Xref: csiph.com gnu.bash.bug:16679 On 8/1/20 8:47 PM, Lawrence Velázquez wrote: >> let v+=1 # Line 18, Once line 11 is uncommented, Bash fails here > > I haven't seen the code for arithmetic expansion, but I assume it > treats v+=1 as morally equivalent to v=${v}+1 (à la C99). Thus there > *is* an expansion, which fails under set -u. Regardless of the > particulars, ksh and zsh again agree: This is indeed what happens in an arithmetic context. It happens with pre- and post-increment and decrement operators, too. -- ``The lyf so short, the craft so long to lerne.'' - Chaucer ``Ars longa, vita brevis'' - Hippocrates Chet Ramey, UTech, CWRU chet@case.edu http://tiswww.cwru.edu/~chet/