From: Pablo Lalloni <plalloni@gmail.com>
To: zsh-users@zsh.org
Subject: Re: Apparent inconsistency in f/z expansion flags behavior
Date: Mon, 19 Dec 2016 12:02:00 -0300 [thread overview]
Message-ID: <CAAiKvi3jscS231SXymepKJzEwnhdSEwhxqvU9Y_rPPJ1mjbrBg@mail.gmail.com> (raw)
In-Reply-To: <161218180807.ZM5238@torch.brasslantern.com>
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Thanks for your responses guys.
Both variations works as you said.
Better yet, I understand why.
Cheers!
On Sun, Dec 18, 2016 at 11:08 PM, Bart Schaefer <schaefer@brasslantern.com>
wrote:
> On Dec 18, 8:02pm, Pablo Lalloni wrote:
> }
> } words=(${(z)$(</proc/meminfo)})
> }
> } Which set words with the array of all the words in the file and that's
> } great.
> }
> } lines=(${(f)$(</proc/meminfo)})
> }
> } But then I get an array with just one string containing all the lines
> } concatenated (no NLs).
>
> That's happening because $(</proc/meminfo) has replaced all the NLs with
> spaces before (z) or (f) begin working. (z) doesn't care because it
> splits on shell-syntax whitespace, but (f) has nothing to split on.
>
> To get what you want, you have to quote the $(...) substitution so the
> NLs are preserved:
>
> lines=(${(f)"$(</proc/meminfo)"})
>
> That would be "more correct" in the (z) use as well, just in case the
> line breaks were e.g. inside quoted strings that would change the shell
> parse. (Not an issue with /proc/meminfo, of course, but in general.)
>
> } Note that if you split the last assignment in 2 steps, it works as
> expected:
> }
> } lines=$(</proc/meminfo)
> } lines=(${(f)lines})
>
> There you've done first an assignment to a scalar, which preserves the
> NLs as if $(...) were quoted.
>
prev parent reply other threads:[~2016-12-19 15:02 UTC|newest]
Thread overview: 4+ messages / expand[flat|nested] mbox.gz Atom feed top
2016-12-18 23:02 Pablo Lalloni
2016-12-18 23:29 ` Jim
2016-12-19 2:08 ` Bart Schaefer
2016-12-19 15:02 ` Pablo Lalloni [this message]
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