help / color / mirror / code / Atom feed
From: "Lawrence Velázquez" <larryv@zsh.org>
To: zsh-users@zsh.org
Subject: Re: CONDITIONAL EXPRESSIONS, string == pattern
Date: Sat, 24 Jul 2021 23:48:44 -0400	[thread overview]
Message-ID: <6A60A149-8728-4140-ADBA-AC67ABDD3BF6@zsh.org> (raw)
In-Reply-To: <45ef93bd-148b-54fc-9815-5b5dbe71d1f0@gmx.com>

> On Jul 24, 2021, at 11:30 PM, Eric Cook <llua@gmx.com> wrote:
> so in:
> eval echo 'test ${vs} == ${vp} && echo hi || echo lo'
> zsh does the normal expansions of the line and passes the arguments to eval, since the single quotes prevented
> any possible expansions the result is:
> echo test ${vs} == ${vp} && echo hi || echo lo
> so the above line goes through the steps of expansions and ends up like so:
> echo test ' str1  a2' '==' '[[:blank:]]##str1[[:blank:]]##[[:alnum:]][[:alnum:]]' && echo hi || echo lo
> so /echo/ prints out the strings given to it, which succeeds, causing echo hi to run.

I'll just add that examining the full contents of 'r' would have
provided a big hint that 'test' wasn't being run at all.

    % cat /tmp/testing2.zsh

    vs=' str1  a2'

    r=( ${(f)"$( eval echo 'test ${vs} == ${vp} && echo hi || echo lo' )"} )
    typeset -p r

    % zsh -f /tmp/testing2.zsh
    typeset -a r=( 'test  str1  a2 == [[:blank:]]##str1[[:blank:]]##[[:alnum:]][[:alnum:]]' hi )


      reply	other threads:[~2021-07-25  3:49 UTC|newest]

Thread overview: 3+ messages / expand[flat|nested]  mbox.gz  Atom feed  top
2021-07-25  2:14 scowles
2021-07-25  3:30 ` Eric Cook
2021-07-25  3:48   ` Lawrence Velázquez [this message]

Reply instructions:

You may reply publicly to this message via plain-text email
using any one of the following methods:

* Save the following mbox file, import it into your mail client,
  and reply-to-all from there: mbox

  Avoid top-posting and favor interleaved quoting:

* Reply using the --to, --cc, and --in-reply-to
  switches of git-send-email(1):

  git send-email \
    --in-reply-to=6A60A149-8728-4140-ADBA-AC67ABDD3BF6@zsh.org \
    --to=larryv@zsh.org \
    --cc=zsh-users@zsh.org \


* If your mail client supports setting the In-Reply-To header
  via mailto: links, try the mailto: link
Be sure your reply has a Subject: header at the top and a blank line before the message body.
Code repositories for project(s) associated with this public inbox


This is a public inbox, see mirroring instructions
for how to clone and mirror all data and code used for this inbox;
as well as URLs for NNTP newsgroup(s).