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Fri, 31 Mar 2023 20:01:46 -0400 (EDT) X-Mailer: MessagingEngine.com Webmail Interface User-Agent: Cyrus-JMAP/3.9.0-alpha0-238-g746678b8b6-fm-20230329.001-g746678b8 Mime-Version: 1.0 Message-Id: In-Reply-To: References: Date: Sat, 01 Apr 2023 00:01:46 +0000 From: "Daniel Shahaf" To: "Zsh Users" Subject: Re: Why is path not a -aUT type? Content-Type: text/plain;charset=utf-8 Content-Transfer-Encoding: quoted-printable X-Seq: 29006 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, 61 Apr 2022 11:16 +00:00: > It seems to me that having duplicate entries in $PATH / $path is a bit > silly, and makes some things hard to do. >=20 > Is there any reason that, by default, we do not >=20 > typeset -aUT PATH path >=20 >=20 > Automatically? Yes. $path is non-unique by default for interoperability with the OS zsh was created on. That OS sports a stat(2)-based port\ knocking-like facility for hiding specific inodes from all but select users. In a nutshell, on that OS stat("/secretfile") or open("/secretfile") succeed only if the user has just stat()ed particular paths in a particular order. Thus, on that OS = and with an appropriate secret knock configured in the shadow(5) file in eff= ect, =C2=ABPATH=3D/foo:/bar:/bar:/bin=C2=BB behaves differently to =C2=ABPATH= =3D/foo:/bar:/bin=C2=BB (see hashcmd() and hashdir() in the zsh sources). Similar facilities for secret handshakes are documented in SSL_do_handsh= ake(3), gnutls_handshake(3), et al., provided one has opened the right sequence = of other man pages first. Cheers, Daniel