Parameter expansion only to existing filenames

Parameter expansion only to existing filenames

[Vin Shelton]

I was recently re-reading the Zsh User Guide (Thanks, Peter!!) and I
started a few experiments.  One need I have that is as yet unfulfilled
is to combine a list of directories and list of files such that only
the ones which exist get listed.  Here's what I mean:

zsh -f
denver% echo $ZSH_VERSION
4.1.1
denver% mkdir a b c
denver% touch a/x b/y c/z
denver% dirs=(a b c)
denver% files=(x y z)
denver% print $^dirs/$^files
a/x a/y a/z b/x b/y b/z c/x c/y c/z

What I'd like to generate is:
a/x b/y c/z

GLOB_SUBST doesn't help:

denver% print $^~dirs/$~^files
a/x a/y a/z b/x b/y b/z c/x c/y c/z

Is this because there's are no patterns to glob?

Is there a clever way to generate the list I want?

Thanks in advance,
  Vin

Re: Parameter expansion only to existing filenames

[Peter Stephenson]

Vin Shelton wrote:
> I was recently re-reading the Zsh User Guide (Thanks, Peter!!) and I
> started a few experiments.  One need I have that is as yet unfulfilled
> is to combine a list of directories and list of files such that only
> the ones which exist get listed.  Here's what I mean:
> 
> zsh -f
> denver% echo $ZSH_VERSION
> 4.1.1
> denver% mkdir a b c
> denver% touch a/x b/y c/z
> denver% dirs=(a b c)
> denver% files=(x y z)
> denver% print $^dirs/$^files
> a/x a/y a/z b/x b/y b/z c/x c/y c/z
> 
> What I'd like to generate is:
> a/x b/y c/z

print $^dirs/$^files(N)

-- 
Peter Stephenson <pws@csr.com>                  Software Engineer
CSR Ltd., Science Park, Milton Road,
Cambridge, CB4 0WH, UK                          Tel: +44 (0)1223 692070


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