From: Matthew Martin <phy1729@gmail.com>
To: zsh-workers@zsh.org
Subject: Re: bug: nested for loop body is executed once!
Date: Thu, 12 Aug 2021 22:47:28 -0500 [thread overview]
Message-ID: <YRXrUK3gO19NCt7O@CptOrmolo.darkstar> (raw)
In-Reply-To: <CAAyLbqKCubQKvXMa5SRkQYgUYBLThzKujm43PmCAuJg45Psdqg@mail.gmail.com>
On Thu, Aug 12, 2021 at 11:13:09PM -0400, Daniil Iaitskov wrote:
> Hi,
>
> I just spot a following bug on Big Sur zsh 5.8 (x86_64-apple-darwin20.0)
>
> $ K="1 2 3"
> > $ for i in $(for j in $K; do echo "ddd/$j" ; done) ; do echo "$i" ; done
> > ddd/1
> > 2
> > 3
That's because zsh doesn't do word splitting on parameter expansions by
default. Running under set -x is illuminating.
+zsh:3> j=1 2 3
+zsh:3> echo 'ddd/1 2 3'
+zsh:3> i=ddd/1
+zsh:3> echo ddd/1
ddd/1
+zsh:3> i=2
+zsh:3> echo 2
2
+zsh:3> i=3
+zsh:3> echo 3
3
j is assigned '1 2 3' and the result of the command substitution is
'ddd/1 2 3'. However word splitting does happen on unquoted command
substitutions, so i is assigned to thrice.
> I would expect following output
>
> > ddd/1
> > ddd/2
> > ddd/3
You want an array: K=(1 2 3)
At which point you could skip the command substitution and instead
for i in ddd/$^K; do ...
next prev parent reply other threads:[~2021-08-13 3:47 UTC|newest]
Thread overview: 4+ messages / expand[flat|nested] mbox.gz Atom feed top
2021-08-13 3:13 Daniil Iaitskov
2021-08-13 3:47 ` Matthew Martin [this message]
2021-08-13 3:50 ` Lawrence Velázquez
2021-08-14 15:07 ` Daniel Shahaf
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