Mailing-List: contact zsh-workers-help@zsh.org; run by ezmlm Precedence: bulk X-No-Archive: yes List-Id: Zsh Workers List List-Post: List-Help: X-Spam-Checker-Version: SpamAssassin 3.4.1 (2015-04-28) on f.primenet.com.au X-Spam-Level: X-Spam-Status: No, score=-1.9 required=5.0 tests=BAYES_00 autolearn=ham autolearn_force=no version=3.4.1 X-AuditID: cbfec7f4-f79026d00000418a-99-56b4e7d887ba Date: Fri, 05 Feb 2016 18:19:53 +0000 From: Peter Stephenson To: Zsh hackers list Subject: Re: Should (t)path = array-unique-special work this way Message-id: <20160205181953.7e61f352@pwslap01u.europe.root.pri> In-reply-to: <20160205174624.60fd0203@pwslap01u.europe.root.pri> References: <160205091543.ZM29723@torch.brasslantern.com> <20160205174624.60fd0203@pwslap01u.europe.root.pri> Organization: Samsung Cambridge Solution Centre X-Mailer: Claws Mail 3.7.9 (GTK+ 2.22.0; i386-redhat-linux-gnu) MIME-version: 1.0 Content-type: text/plain; charset=US-ASCII Content-transfer-encoding: 7bit X-Brightmail-Tracker: H4sIAAAAAAAAA+NgFrrILMWRmVeSWpSXmKPExsVy+t/xK7o3nm8JM/h4x9TiYPNDJgdGj1UH PzAFMEZx2aSk5mSWpRbp2yVwZTRPamUpOM9dceX1FeYGxs2cXYycHBICJhL9p84zQ9hiEhfu rWfrYuTiEBJYyijR+WoCO0hCSGAGk8T2ve4QidOMEreu7mGCcM4wSpzuXw5WxSKgKvHj9iRG EJtNwFBi6qbZYLaIgJbEjpMnmUBsYQEHiRnvIGxeAXuJaUtWgNmcQPEP6zazQwz9zyjRtuc6 2FB+AX2Jq38/MUHcZy8x88oZRohmQYkfk++xgNjMQAs2b2tihbDlJTavecsMcba6xI27u9kn MArPQtIyC0nLLCQtCxiZVzGKppYmFxQnpeca6hUn5haX5qXrJefnbmKEBPSXHYyLj1kdYhTg YFTi4c1YvTlMiDWxrLgy9xCjBAezkggv18EtYUK8KYmVValF+fFFpTmpxYcYpTlYlMR55+56 HyIkkJ5YkpqdmlqQWgSTZeLglGpg5NuaOj9n6XGPEJseJ6uG9Sf2/lsg/Xv2/ezzVUq57/2l G/6ft+tguTjjJvcKmU4N9ckRPAEqTQZfrM6cDC6ePP9nJavfJcmJMg++THPhqD7gHujAftxA Zq3Ni1MVh6VZQyTsGntPTTJwlH0ieN9b4Ni36xNs2c9X2C34416ReWbqNvvDBb3RSizFGYmG WsxFxYkAGZuwN2QCAAA= X-Seq: zsh-workers 37893 On Fri, 5 Feb 2016 17:46:24 +0000 Peter Stephenson wrote: > On Fri, 05 Feb 2016 18:34:06 +0100 > Sebastian Gniazdowski 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) ])(