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Thu, 21 Oct 2021 08:23:27 -0700 (PDT) MIME-Version: 1.0 References: <27bc215c-3916-4afe-b8b3-7946dd0cb4bc@www.fastmail.com> <20210814155252.GG11391@tarpaulin.shahaf.local2> <20211021142408.GB16034@tarpaulin.shahaf.local2> In-Reply-To: <20211021142408.GB16034@tarpaulin.shahaf.local2> From: Bart Schaefer Date: Thu, 21 Oct 2021 08:23:15 -0700 Message-ID: Subject: Re: Odd behavior with various (q) array modifiers and non-printable characters (backspace, newline) To: Daniel Shahaf Cc: Zach Riggle , =?UTF-8?Q?Lawrence_Vel=C3=A1zquez?= , Zsh Users Content-Type: text/plain; charset="UTF-8" Content-Transfer-Encoding: quoted-printable X-Seq: 27258 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: On Thu, Oct 21, 2021 at 7:24 AM Daniel Shahaf wrot= e: > > Zach Riggle wrote on Tue, Oct 19, 2021 at 14:17:48 -0500: > > 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 =C2=AB\b=C2=BB literally (two printable characters)? = It > should emit backspaces (ASCII 0x08). He's trying to use \b as a word boundary marker in a regular expression so he wants literal \b rather than backspace. % builtin echo '\bfoo bar\b' | od -ac 0000000 bs f o o sp b a r bs nl \b f o o b a r \b \n 0000012 % command echo '\bfoo bar\b' | od -ac 0000000 \ b f o o sp b a r \ b nl \ b f o o b a r \ b \n 0000014 (apologies if you're looking at this in a proportional font)