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From: =?UTF-8?B?SsOpcsOpbWllIFJvcXVldA==?= <arkanosis@gmail.com>
Date: Fri, 7 Sep 2012 14:47:08 +0200
Message-ID: <CAFOazANjtNgy23x+1hPKsQ2hKDTQc2RwF2STU5baszFmX95XNw@mail.gmail.com>
Subject: Re: double quoted expansion question
To: Sebastian Stark <seb-zsh@biskalar.de>
Cc: zsh-users@zsh.org
Content-Type: text/plain; charset=UTF-8
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Hi,

2012/9/7 Sebastian Stark <seb-zsh@biskalar.de>:
> I am trying to make a unique list of tags that is given in a string with =
a certain format, e.  g.:
>
>   servers=3D"
>   madeira linux,gpu,users
>   madeira2 linux,gpu,users
>   smtp linux,mail,smtp
>   isar linux,users
>   easygwa linux,web,external
>   "
>
> The format is: server name, space, tag, comma, tag, comma, tag ...
>
> What I want from the above list is this:
>
>   external gpu linux mail smtp users web
>
> and I get it with:
>
>   print  ${(s:,:uo)${(j:,:)${${(f)servers}//* /}}}
>
> However, if I do this:
>
>   print "${(s:,:uo)${(j:,:)${${(f)servers}//* /}}}"
>
> I get:
>
>   external linux web
>
> This also happens when I use the variable expansion expression in a here =
document, which, I suppose, is undergoing the same treatment as double quot=
ed strings.
>
> What I would like to understand here is why the output changes the way it=
 does when I add double quotes around my expression. I would expect the sam=
e output as without. If anybody could shed some light please, I guess it's =
just something obvious I cannot see.

I'm not 100=C2=A0% sure, but I suppose the quotes prevents the shell from
splitting your string on $IFS, so you only have *one* string, and the
=E2=80=9C//* /" expression suppresses everything before the last space,
leaving only the tags of the last line.

Best regards,

--=20
J=C3=A9r=C3=A9mie