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Mon, 07 Nov 2022 22:14:04 -0800 (PST) MIME-Version: 1.0 References: In-Reply-To: From: Bart Schaefer Date: Mon, 7 Nov 2022 22:13:53 -0800 Message-ID: Subject: Re: while alias To: Pier Paolo Grassi Cc: Zsh-Users List Content-Type: text/plain; charset="UTF-8" X-Seq: 28336 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 Mon, Nov 7, 2022 at 5:57 PM Pier Paolo Grassi wrote: > > Hello, I have the following alias defined: > > WI='while {read -r it; ! [[ $? -ne 0 && -z $it ]]}' > > that works fine except in command substitution: Put spaces around your braces. alias WI='while { read -r it; ! [[ $? -ne 0 && -z $it ]] }' Aliases in command substitutions are parsed by a complicated dance requiring that they be expanded and then backtracked over and then re-parsed. The character count for the "{" and/or "}" tokens is off by one for the backtracking step when they don't have surrounding whitespace. (Leaving it to PWS, who choreographed this dance number, to fix the footwork if possible.)