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Sat, 2 Jul 2022 22:28:35 -0400 (EDT) X-Mailer: MessagingEngine.com Webmail Interface User-Agent: Cyrus-JMAP/3.7.0-alpha0-713-g1f035dc716-fm-20220617.001-g1f035dc7 Mime-Version: 1.0 Message-Id: In-Reply-To: References: <11ca04c9-1503-4cd2-a44b-635dc53e43a8@www.fastmail.com> Date: Sat, 02 Jul 2022 22:28:10 -0400 From: "Anthony Heading" To: "Bart Schaefer" Cc: "Zsh Users" Subject: Re: indirect array element assignment? Content-Type: text/plain X-Seq: 27862 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 Sat, Jul 2, 2022, at 2:13 PM, Bart Schaefer wrote: > You can do it this way: > > z="${v}[3]" > echo ${(P)z::=cherry} Wow. Thank you! I didn't think of that at all. > It's not that it doesn't support subscripting, it's that it doesn't > support parameter expansions of any kind on the left: > > % echo ${${grape}::=raisin} > zsh: not an identifier: Ah, that makes sense. Though hmm... there's some lhs expansion, no? ${grape[$#grape]::=raisin} for example. Is it a necessary error by design? I see why the (P) flag is needed for rhs expansion because shell ${${${...}}} defines nesting to mean something different, but for lhs ::= I wonder why ${${X}::=...} couldn't have well-defined natural meaning. > There really isn't a good solution if you're trying to do array > slices, i.e., a parenthesized list on the right of the "=". You're referring to the typeset style solution here, maybe? Your later solution seems to work great for all sorts of array splicing. fruits=(apple banana carrot calamansi cherry cantaloupe durian) # hunt down the errant vegetable and all its friends v="fruits" z="${v}[(r)c*,(R)c*]" : ${(PA)z::=$signals[10,11]} echo $fruits % apple banana KILL USR1 durian