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Date: Fri, 02 Aug 2013 12:38:43 +0200
From: Maarten Grachten <maarten.grachten@gmail.com>
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To: zsh-users@zsh.org
Subject: search through alternative HISTFILE
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Dear zsh users,

As part of an attempt to archive my command line history, I have a need 
for bck-i-search (as normally invoked by Ctrl-R), but with a history 
file that is not $HISTFILE, that is, a different file from that which 
the current shell uses for saving its history.

As I envision it, Ctrl-R would still search through the current shell's 
history (i.e. through $HISTFILE), and another key binding would search 
through an alternative but constant histfile (say 
$HOME/.accumulated-history).

Is this possible, and if so, can any of you give me a hint as to how to 
achieve it?

Many thanks in advance!

Maarten