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Sun, 21 Feb 2021 15:03:21 -0800 (PST) MIME-Version: 1.0 References: <6a5328e7-e58d-5b47-c0df-463bf4c144ea@eastlink.ca> <5009d6df-0202-380b-b2b6-6ba024a14555@eastlink.ca> In-Reply-To: <5009d6df-0202-380b-b2b6-6ba024a14555@eastlink.ca> From: Bart Schaefer Date: Sun, 21 Feb 2021 15:03:10 -0800 Message-ID: Subject: Re: read -sq To: Ray Andrews Cc: Zsh Users Content-Type: text/plain; charset="UTF-8" X-Seq: 26553 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: On Sun, Feb 21, 2021 at 1:58 PM Ray Andrews wrote: > > ... > > : ${(P)${1:-REPLY}::=''} > > this is fundamental syntax that I still don't understand. Replace it everywhere with typeset -g ${1:-REPLY}=whatever if that makes it more readable. You know what ${1:-REPLY} does, I presume. ${thing::=value} assigns value to $thing and substitutes value ${(P)thing} uses the value of thing as a variable name and retrieves that variable So ${(P)${1:-REPLY}::=''} is: -- get $1 or if it isn't set use REPLY -- retrieve the variable whose name that is -- assign the empty string to that variable Then the ":" command is merely to throw away the substituted result of ${...}.