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Thu, 15 Apr 2021 11:19:28 -0700 (PDT) MIME-Version: 1.0 References: <20210407070518.szoet4rxbouwzelm@chazelas.org> <2902540a-9c07-4423-b0bb-6802af6e97a2@www.fastmail.com> <48bef9cb-fea7-1a17-96b1-dd4ae7bf54aa@spamtrap.tnetconsulting.net> <20210409224930.GB6760@tarpaulin.shahaf.local2> <41baeb56-de2f-2fb2-3544-ce703bf96223@rayninfo.co.uk> <6717f359-f340-a436-c2dd-1b9ae19d345a@rayninfo.co.uk> In-Reply-To: <6717f359-f340-a436-c2dd-1b9ae19d345a@rayninfo.co.uk> From: Bart Schaefer Date: Thu, 15 Apr 2021 11:19:16 -0700 Message-ID: Subject: Re: alias with a parameter To: zzapper Cc: Zsh Users Content-Type: text/plain; charset="UTF-8" X-Seq: 26652 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 Wed, Apr 14, 2021 at 4:10 AM zzapper wrote: > > Am using a case statement as a ***visually elegant way*** of excluding a > potentially changing list of Global Aliases from being automatically > expanded Sorry, you're using this ... where? ... to achieve that? > if [ $# -gt 0 ] ; then > case $1 in > [A-Z] | V<-> | G* ) ;; > *) echo "Yes expand" > ;; > esac > fi It's generally preferable to use [[ ... ]] instead of [ ... ] because "[" is just another name for "test" and "]" is just one of its arguments, whereas "[[" and "]]" are syntax tokens with parsing rules for what appears between them. However, since you're comparing numbers, you could use (( $# > 0 )) here. However you really don't need that test at all: case "$1" in ("") false;; ([A-Z]|V<->|G*);; (*) echo "Yes expand";; esac You probably don't even need the first "false'' case, I threw it in just to keep the same $? as your original "if". case "$1" in (|[A-Z]|V<->|G*);; (*) echo "Yes expand";; esac