Path: csiph.com!xmission!news.snarked.org!news.linkpendium.com!news.linkpendium.com!panix!usenet.stanford.edu!not-for-mail From: Chet Ramey Newsgroups: gnu.bash.bug Subject: Re: No word splitting for assignment-like expressions in compound assignment Date: Tue, 28 Jul 2020 10:22:35 -0400 Organization: ITS, Case Western Reserve University Lines: 28 Approved: bug-bash@gnu.org Message-ID: References: <6614fa7668daf7f2b450e319a28b624c@ispras.ru> <58020735-2ddb-e1a4-a513-a09560876e87@case.edu> 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: 7bit X-Trace: usenet.stanford.edu 1595946229 19407 209.51.188.17 (28 Jul 2020 14:23:49 GMT) X-Complaints-To: action@cs.stanford.edu Cc: chet.ramey@case.edu To: Alexey Izbyshev , bug-bash@gnu.org Envelope-to: bug-bash@gnu.org DKIM-Signature: v=1; a=rsa-sha256; c=relaxed/relaxed; d=case.edu; s=smtp-primary; t=1595946224; bh=FZ5JJalU3N7BwKcha5DU10kT5AmQaDUrvD/c3LRhOpg=; 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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 = 2020/07/28 10:22:39 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=unavailable 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: <58020735-2ddb-e1a4-a513-a09560876e87@case.edu> X-Mailman-Original-References: <6614fa7668daf7f2b450e319a28b624c@ispras.ru> Xref: csiph.com gnu.bash.bug:16638 On 7/23/20 8:11 PM, Alexey Izbyshev wrote: > Hello! > > I have a question about the following behavior: > > $ Z='a b' > $ A=(X=$Z) > $ declare -p A > declare -a A=([0]="X=a b") > $ A=(X$Z) > $ declare -p A > declare -a A=([0]="Xa" [1]="b") > > I find it surprising that no word splitting is performed in the first > compound assignment. I realize that skipping word splitting may be > desirable if a subscript is given (e.g. "A=([0]=$Z)") to make it consistent > with normal variable assignment[1], but in this case it looks like a bug. It's an assignment statement in a context where assignment statements are accepted (which is what makes it different from `echo X=$Z', for instance), but the lack of a subscript on the lhs makes it a special case. I'll take a look at the semantics here. -- ``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/