From: Ray Andrews <rayandrews@eastlink.ca>
To: zsh-users@zsh.org
Subject: Re: ${var:1:1:=y}
Date: Tue, 03 Feb 2015 21:16:54 -0800 [thread overview]
Message-ID: <54D1AB46.8050201@eastlink.ca> (raw)
In-Reply-To: <150203192508.ZM2159@torch.brasslantern.com>
On 02/03/2015 07:25 PM, Bart Schaefer wrote:
> You've forgotten that ${var=val} has the side-effect of assigning to
> "var" if it is not set.
No, it was just irrelevant there.
> I think what you mean is what Lawrence already
> demonstrated (again several messages ahead):
>
> variable=${${var:1:1}:-y}
Ah, I thought it might be like that, one of those 'nested' things.
Nothing you can't do with those if you know how.
> However, you can do this with subscript syntax:
>
> variable=${var[2]:=y}
>
> which either assigns to $variable the second character of $var, or
> assigns "y" to both $variable and to the second character of $var.
Even softer.
> You can also do ${var[2]::=z} to forcibly assign "z" to the second
> character of $var.
Excellent.
>
> (Actually the doc might not say exactly that due to a Yodl formatting
> error, but that's what it is supposed to say. The part about a single
> `-' in a separate word is correct and is what matters here.)
Ok, all good. Fact is, I'd not have a clue where I'd look to find that
information. Thanks both.
>
prev parent reply other threads:[~2015-02-04 5:47 UTC|newest]
Thread overview: 16+ messages / expand[flat|nested] mbox.gz Atom feed top
2015-02-03 23:12 ${var:1:1:=y} Ray Andrews
2015-02-04 0:18 ` ${var:1:1:=y} Lawrence Velázquez
2015-02-04 0:39 ` ${var:1:1:=y} Ray Andrews
2015-02-04 1:30 ` ${var:1:1:=y} Lawrence Velázquez
2015-02-04 3:25 ` ${var:1:1:=y} Bart Schaefer
2015-02-04 3:44 ` ${var:1:1:=y} Eric Cook
2015-02-04 17:10 ` The "-" and "--" options (was Re: ${var:1:1:=y}) Bart Schaefer
2015-02-04 17:42 ` Ray Andrews
2015-02-04 23:47 ` Lawrence Velázquez
2015-02-05 1:31 ` Ray Andrews
2015-02-05 1:52 ` Kurtis Rader
2015-02-05 2:03 ` Ray Andrews
2015-02-05 2:24 ` Bart Schaefer
2015-02-04 19:02 ` Peter Stephenson
2015-02-04 19:53 ` ZyX
2015-02-04 5:16 ` Ray Andrews [this message]
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