From: Peter Stephenson <p.stephenson@samsung.com>
To: Zsh hackers list <zsh-workers@zsh.org>
Subject: Re: Should (t)path = array-unique-special work this way
Date: Fri, 05 Feb 2016 18:19:53 +0000 [thread overview]
Message-ID: <20160205181953.7e61f352@pwslap01u.europe.root.pri> (raw)
In-Reply-To: <20160205174624.60fd0203@pwslap01u.europe.root.pri>
On Fri, 5 Feb 2016 17:46:24 +0000
Peter Stephenson <p.stephenson@samsung.com> wrote:
> On Fri, 05 Feb 2016 18:34:06 +0100
> Sebastian Gniazdowski <sgniazdowski@gmail.com> wrote:
> > That was my question. The path has *-unique in type, this could be
> > viewed as a guard that no repetition is possible, but the guard is
> > avoided by assigning to PATH. That's from one point of view
> > unexpected.
>
> It wasn't your question, but you can of course make PATH unique too, and
> I suppose an additional lesson is that for least surprises you might
> want always to do
>
> typeset -U path PATH
The behaviour doesn't look like it's documented, at least not in the
obvious place. The language might be a bit clunky for a shell manual.
diff --git a/Doc/Zsh/builtins.yo b/Doc/Zsh/builtins.yo
index fb630a7..a15f4c2 100644
--- a/Doc/Zsh/builtins.yo
+++ b/Doc/Zsh/builtins.yo
@@ -1980,6 +1980,11 @@ item(tt(-U))(
For arrays (but not for associative arrays), keep only the first
occurrence of each duplicated value. This may also be set for
colon-separated special parameters like tt(PATH) or tt(FIGNORE), etc.
+Note the flag takes effect on assignment, and the type of the
+variable being assigned to is determinative; for variables with
+shared values it is therefore recommended to set the flag for
+all interfaces, e.g. `tt(typeset -U PATH path)'.
+
This flag has a different meaning when used with tt(-f); see below.
)
item(tt(-Z) [ var(n) ])(
next prev parent reply other threads:[~2016-02-05 18:20 UTC|newest]
Thread overview: 10+ messages / expand[flat|nested] mbox.gz Atom feed top
2016-02-05 13:45 Sebastian Gniazdowski
2016-02-05 17:15 ` Bart Schaefer
2016-02-05 17:34 ` Sebastian Gniazdowski
2016-02-05 17:46 ` Peter Stephenson
2016-02-05 18:19 ` Peter Stephenson [this message]
2016-02-14 10:04 ` Sebastian Gniazdowski
2016-02-14 10:19 ` Sebastian Gniazdowski
2016-02-14 14:34 ` Daniel Shahaf
2016-02-14 18:44 ` Bart Schaefer
2016-02-15 8:25 ` Sebastian Gniazdowski
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