From: Ray Andrews <rayandrews@eastlink.ca>
To: zsh-users@zsh.org
Subject: Re: for loop question
Date: Sun, 02 Nov 2014 14:44:54 -0800 [thread overview]
Message-ID: <5456B3E6.4040907@eastlink.ca> (raw)
In-Reply-To: <20141102213713.GA4412@chaz.gmail.com>
On 11/02/2014 01:37 PM, Stephane Chazelas wrote:
> You could with:
>
> for ((i=1; (z[$([ -n "$TLC[i]" ])0]),$? == 0; i++))
> print -ru2 -- $TLC[i]
>
> (not that you would want to).
No. That is pure sadism ;-) ;-)
But it does show that 'for ((' CAN stop and digest ' [ -n "$TLC[i]" ]
' if it wants too,
it just has to make it obscenely difficult. Why can't the truth test of
a command just be taken
as 'arithmetic' plain and simple?
$ for ((; 1 ;)) echo true!
true!
true!
true!
.....
$ for ((; 0 ;)) echo true!
[nothing]
.... so why/how is it that the return value of a ' [] ' test is NOT
either 1 or 0?
Thanks for these, there is much to learn from them:
> Here, you more likely want:
>
> for i ("$TLC[@]") print -ru2 -- $i
>
> or
>
> print -rlu2 -- "$TLC[@]"
>
> or:
>
> for ((i = 1; i <= $#TLC; i++)) print -ru2 -- $TLC[i]
>
>
> Or (to print only till the first empty element):
>
> for ((i = 1; $#TLC[i]; i++)) print -ru2 -- "$TLC[i]"
>
> Or:
>
> print -rlu2 -- "${(@)TLC[1,TLC[(i)]-1]}"
>
next prev parent reply other threads:[~2014-11-02 22:42 UTC|newest]
Thread overview: 19+ messages / expand[flat|nested] mbox.gz Atom feed top
2014-11-02 20:47 Ray Andrews
2014-11-02 21:00 ` Bart Schaefer
[not found] ` <CAH+w=7aWS0xyS4CXRJBphDjesfUFQOsyJRMaG3RZRxmuj7xkOg__20885.3257158355$1414962125$gmane$org@mail.gmail.com>
2014-11-02 21:37 ` Stephane Chazelas
2014-11-02 22:44 ` Ray Andrews [this message]
2014-11-02 22:57 ` Bart Schaefer
2014-11-02 23:24 ` Oliver Kiddle
2014-11-03 0:07 ` Ray Andrews
2014-11-03 1:53 ` Mikael Magnusson
2014-11-03 2:22 ` Ray Andrews
2014-11-03 9:22 ` Mikael Magnusson
2014-11-03 17:26 ` Ray Andrews
2014-11-04 1:56 ` Han Pingtian
2014-11-04 2:29 ` Han Pingtian
2014-11-04 2:43 ` Bart Schaefer
2014-11-04 4:51 ` Han Pingtian
2014-11-04 6:37 ` Ray Andrews
2014-11-04 7:13 ` Bart Schaefer
2014-11-04 18:00 ` Ray Andrews
[not found] ` <141103184338.ZM32221__48957.5251042426$1415069142$gmane$org@torch.brasslantern.com>
2014-11-04 7:08 ` Stephane Chazelas
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