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No duplicate entries in history


From: address@hidden
Subject: No duplicate entries in history
Date: 24 Nov 2006 04:28:05 -0800
User-agent: G2/1.0

I see file-name-history and probably others have duplicate entries. Is
there an option to tell the history facility not to store duplicate
entries?

I saw references in this group to history-delete-duplicates, but I
don't have it in emacs 21.



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