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Thu, 21 Oct 2021 10:24:11 -0400 (EDT) Received: by tarpaulin.shahaf.local2 (Postfix, from userid 1005) id 4HZqVJ3gkWz4hN; Thu, 21 Oct 2021 14:24:08 +0000 (UTC) Date: Thu, 21 Oct 2021 14:24:08 +0000 From: Daniel Shahaf To: Zach Riggle Cc: Lawrence =?iso-8859-1?Q?Vel=E1zquez?= , Zsh Users Subject: Re: Odd behavior with various (q) array modifiers and non-printable characters (backspace, newline) Message-ID: <20211021142408.GB16034@tarpaulin.shahaf.local2> References: <27bc215c-3916-4afe-b8b3-7946dd0cb4bc@www.fastmail.com> <20210814155252.GG11391@tarpaulin.shahaf.local2> MIME-Version: 1.0 Content-Type: text/plain; charset=iso-8859-1 Content-Disposition: inline Content-Transfer-Encoding: 8bit In-Reply-To: User-Agent: Mutt/1.10.1 (2018-07-13) X-Seq: 27257 Archived-At: X-Loop: zsh-users@zsh.org Errors-To: zsh-users-owner@zsh.org Precedence: list Precedence: bulk Sender: zsh-users-request@zsh.org X-no-archive: yes List-Id: List-Help: List-Subscribe: List-Unsubscribe: List-Post: List-Owner: List-Archive: Zach Riggle wrote on Tue, Oct 19, 2021 at 14:17:48 -0500: > Apologies for resurrecting this thread, but I wanted to revisit and thank > everybody for the help. > > I ran into some issues where my > print-a-$-and-then-the-minally-quoted-version-of-this-array-of-scalars when > dealing with regex, due to "builtin echo" treating '\bfoo bar\b' > incorrectly. > Why, does it output «\b» literally (two printable characters)? It should emit backspaces (ASCII 0x08). > I attempted a variety of things to fix the problem, but going back through > this thread really helped a bunch. I had written additional code that > relied in builtin echo. "command echo" and the issue is resolved. > echo(1)'s semantics aren't portable. Use printf(1) for portable sh code or the builtin «print» for portable zsh code. Daniel