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vanishing history

X-seq: zsh-users 4514
From: Adam Spiers <adam@xxxxxxxxxx>
To: zsh users mailing list <zsh-users@xxxxxxxxxxxxxx>
Subject: vanishing history
Date: Wed, 28 Nov 2001 16:19:05 +0000
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Reply-to: Adam Spiers <adam@xxxxxxxxxx>
Sender: "Adam Spiers,,07775562717,020 88 30 30 35" <adam@xxxxxxxxxxxxxxxxxxxx>

Does anyone have any idea why my .zshhistory occasionally looses the
vast majority of its contents?  I can't reproduce it, so I can't begin
to track down what's going on.  I have the following settings:

HISTSIZE=3000
cshjunkiehistory
extendedhistory
histallowclobber
histexpiredupsfirst
histignorealldups
histignoredups
histreduceblanks
histverify
incappendhistory

I'm running 4.1.0-dev-2 from CVS.  I have a _very_ vague suspicion
that it might be something to do with running different versions of
zsh on the same history file, or maybe zcompile comes into it somehow,
but really I haven't a clue.  I wanted to get my .zshrc to
automatically alert me when it happens, via:

  _check_hist_size () {
    fc_out=( $(fc -l -1) )
    if (( "$fc_out[1]" < 500 )); then
      print "\nWARNING: Small history ($fc_out[1]) detected\!"
    fi
  }

but that just resulted in:

  _check_hist_size:fc:1: no such event: 0
  _check_hist_size:2: no such file or directory: 500

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