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From: Bart Schaefer <schaefer@brasslantern.com>
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Date: Sun, 6 Nov 2016 19:20:03 -0800
In-Reply-To: <20161107023001.GA13317@localhost.localdomain>
Comments: In reply to Han Pingtian <hanpt@linux.vnet.ibm.com>
        "Re: What's the 'word' in parameter relpacement expansion?" (Nov  7, 10:30am)
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	<20161104090009.GA22682@localhost.localdomain> 
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Subject: Re: What's the 'word' in parameter relpacement expansion?
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On Nov 7, 10:30am, Han Pingtian wrote:
}
} Thanks. So ':/' is the same thing of '/#%'? It looks like a kind of
} redundance.

Yes, these are very similar.  One form was invented by zsh, the other
was imported from another shell for compatibility.