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Date: Sat, 10 Oct 2015 06:59:35 +0000
From: Phil Pennock <zsh-workers+phil.pennock@spodhuis.org>
To: Ray Andrews <rayandrews@eastlink.ca>
Cc: zsh-users@zsh.org
Subject: Re: what is truth?
Message-ID: <20151010065935.GA18624@tower.spodhuis.org>
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 <20151010005939.GK12039@sym.noone.org>
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On 2015-10-09 at 20:24 -0700, Ray Andrews wrote:
> 
> test ()
> {
> [[ "$1" = <-> ]]  && echo true
> }
> 
> I don't have a clue what to make of ' <-> '.  What value
> would work?

Any number.
Well, okay, any non-negative integer.

It's a glob operator:
----------------------------8< cut here >8------------------------------
 <[x]-[y]>
        Matches any number in the range x to y,  inclusive.   Either  of
        the  numbers  may be omitted to make the range open-ended; hence
        `<->' matches any number.  To match individual digits, the [...]
        form is more efficient.
----------------------------8< cut here >8------------------------------