Path: csiph.com!goblin2!goblin1!goblin.stu.neva.ru!usenet.stanford.edu!not-for-mail From: worley@alum.mit.edu (Dale R. Worley) Newsgroups: gnu.bash.bug Subject: Re: Undocumented for-loop construct Date: Thu, 06 Aug 2020 22:29:38 -0400 Lines: 17 Approved: bug-bash@gnu.org Message-ID: References: (klaas.vantournhout@gmail.com) <87364zur1p.fsf@hobgoblin.ariadne.com> NNTP-Posting-Host: lists.gnu.org X-Trace: usenet.stanford.edu 1596767404 28947 209.51.188.17 (7 Aug 2020 02:30:04 GMT) X-Complaints-To: action@cs.stanford.edu Cc: bug-bash@gnu.org To: Klaas Vantournhout Envelope-to: bug-bash@gnu.org DKIM-Signature: v=1; a=rsa-sha256; c=relaxed/relaxed; d=comcastmailservice.net; s=20180828_2048; t=1596767392; bh=zx3+sP244P4S5Jgrih+fH4OQ6BJPVwcAJiDQnG92n4U=; h=Received:Received:Received:Received:From:To:Subject:Date: Message-ID; b=S8xTN/GEDNRTa/JSCRUtISTjlzQkRRFjMUlKyemINRQE0nK9VYE/6Zq0LDNKLEESX XpznReIO2n5aDNN80WLfWosxGhSeB+t6VOGoP1WIg/6wRprZqyQ9Mig4inO1ZjVBUM cl340LoZL8dxf4I91t1lgm2dkPjK3AZUnZ1YsfreLPuJLaZ+kv8/6f0axmM0fcTK2p yyjktAu6NxT7xJQ+SXO9ZvX1cV+WiAjxhyCVLLgGNWsinE1TigT9ECgh61H/M2xO7+ aw722TezMOkj8xNUzGmvebe8X748+NIYqPIKMxNJkYatgnDz3bayG0+12qhJCzRsoW BS9CDCc/m9wbA== X-Xfinity-VMeta: sc=-100.00;st=legit X-Authentication-Warning: hobgoblin.ariadne.com: worley set sender to worley@alum.mit.edu using -f In-Reply-To: (klaas.vantournhout@gmail.com) Received-SPF: softfail client-ip=2001:558:fe21:29:69:252:207:39; envelope-from=worley@alum.mit.edu; helo=resqmta-ch2-07v.sys.comcast.net X-detected-operating-system: by eggs.gnu.org: First seen = 2020/08/06 22:29:52 X-ACL-Warn: Detected OS = ??? X-Spam_score_int: -11 X-Spam_score: -1.2 X-Spam_bar: - X-Spam_report: (-1.2 / 5.0 requ) BAYES_00=-1.9, DKIM_SIGNED=0.1, DKIM_VALID=-0.1, RCVD_IN_DNSWL_NONE=-0.0001, SPF_HELO_NONE=0.001, SPF_SOFTFAIL=0.665, URIBL_BLOCKED=0.001 autolearn=no 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: <87364zur1p.fsf@hobgoblin.ariadne.com> Xref: csiph.com gnu.bash.bug:16729 Klaas Vantournhout writes: > Recently I came across a surprising undocumented bash-feature > > $ for i in 1 2 3; { echo $i; }; > > The usage of curly-braces instead of the well-documented do ... done > construct was a complete surprise to me and even lead me to open the > following question on stack overflow: Interesting! Looking at parse.y, it looks like do ... done can be replaced with { ... } in 'for' and 'select' statements, but not 'while' and 'until' statements. Not clear why that would be, though I haven't tried extending while/until and recompiling parse.y; maybe it doesn't work. Dale