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Wed, 3 Mar 2021 15:12:50 -0500 (EST) Received: by tarpaulin.shahaf.local2 (Postfix, from userid 1005) id 4DrQCg4vcZzyX; Wed, 3 Mar 2021 20:12:47 +0000 (UTC) Date: Wed, 3 Mar 2021 20:12:47 +0000 From: Daniel Shahaf To: zzapper Cc: zsh-users@zsh.org Subject: Re: disown -a Message-ID: <20210303201247.GB11821@tarpaulin.shahaf.local2> References: <28c28f42-632d-4ebc-857e-64022f59a895@www.fastmail.com> <20210303071549.oessnssr3n4w4acj@chazelas.org> <4e2d5b5f-18ae-de72-dadc-2eb3e2076714@rayninfo.co.uk> MIME-Version: 1.0 Content-Type: text/plain; charset=iso-8859-1 Content-Disposition: inline Content-Transfer-Encoding: 8bit In-Reply-To: <4e2d5b5f-18ae-de72-dadc-2eb3e2076714@rayninfo.co.uk> User-Agent: Mutt/1.10.1 (2018-07-13) X-Seq: 26576 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: Archived-At: To add to pws's answer: zzapper wrote on Wed, Mar 03, 2021 at 09:36:13 +0000: > Now something I've never quite got my head round is or isn't the underlying > binary in bash & zsh for say disown or  grep actually the same on any > particular system? For grep, yes. /bin/grep is the same thing regardless of what its parent process is. (That said, a process _could_ behave differently depending on what its parent is, if it wanted to.) disown, as mentioned by pws and elsethread, is a shell builtin. In zsh it's implemented as part of /bin/zsh; in bash it's presumably implemented as part of /bin/bash. Generally, bash and zsh's implementations of builtins are different.