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From: Bart Schaefer <schaefer@brasslantern.com>
Message-id: <130314111246.ZM19060@torch.brasslantern.com>
Date: Thu, 14 Mar 2013 11:12:46 -0700
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 <OF04456934.5C5AA7AE-ONC1257B2E.0044D95E-C1257B2E.0044E81A@de.ibm.com>
Comments: In reply to Dominik Vogt <VOGT@de.ibm.com>
 "searching words in history similar to insert-last-word" (Mar 14,  1:32pm)
References:
 <OF04456934.5C5AA7AE-ONC1257B2E.0044D95E-C1257B2E.0044E81A@de.ibm.com>
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Subject: Re: searching words in history similar to insert-last-word
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On Mar 14,  1:32pm, Dominik Vogt wrote:
}
} Great, that's almost exactly what I was looking for.  Is there a way to get
} rid of the duplicates though?

zstyle ':completion:history-words:*' remove-all-dups yes

You might also want

zstyle ':completion:history-words:*' sort yes