From: Bart Schaefer <schaefer@brasslantern.com>
To: Zach Riggle <zachriggle@gmail.com>
Cc: Zsh Users <zsh-users@zsh.org>
Subject: Re: Commenting and large pipelines
Date: Wed, 11 May 2022 23:15:35 -0700 [thread overview]
Message-ID: <CAH+w=7bio+NHv6gkg=2LEE24hOanJw=gcJhZq1GXSMucgw=u-g@mail.gmail.com> (raw)
In-Reply-To: <CAMP9c5mWOpVwTpDrrJ4JheYimwcTJRyuoWy9XDdMFJo6eQSb4w@mail.gmail.com>
In addition to what Lawrence said ...
On Tue, May 10, 2022 at 11:35 PM Zach Riggle <zachriggle@gmail.com> wrote:
>
> 3. Is the use of {} better than ()?
In most cases it won't matter. Putting something on the left side of
a pipe in zsh already starts it in a subshell, and most such subshells
are subject to an optimization such that zsh will exec the last
command to replace the shell process.
On the right side of a pipe, however commands in { } stay in the
current shell whereas those in ( ) run in a forked subshell.
> 4. How much of a performance hit does this make, versus hand-writing a different pipeline?
It's definitely going to perform better than a pipeline built by
assigning and expanding array parameters. Otherwise the performance
difference should be minimal.
> 5. Are there any ways to improve this? For example, replacing 'cat' in the default case.
You're not going to do better than "cat" in that context.
prev parent reply other threads:[~2022-05-12 6:16 UTC|newest]
Thread overview: 3+ messages / expand[flat|nested] mbox.gz Atom feed top
2022-05-11 6:34 Zach Riggle
2022-05-11 7:13 ` Lawrence Velázquez
2022-05-12 6:15 ` Bart Schaefer [this message]
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