Re: Bug: Losing .zsh_history

[Bart Schaefer <schaefer@xxxxxxxxxxxxxxxx>]

On Wed, Oct 5, 2022 at 12:55 PM Dominik Vogt <dominik.vogt@xxxxxx> wrote:
>
> I wonder if this situation could be prevented by changing the code
> that writes the history file at exit.  Is truncating the file to
> zero size part of the procedure?  When I need to write a file in a
> safe manner, the procedure normally looks like this:
>
>  * Create file.new
>  * Rename file to file.old
>  * Rename file.new to file
>  (* Possibly sync filesystem)
>  * Erase file.old

zsh is not going to sync the filesystem for you.  Other than that,
though, the default behavior should be close to what you just
described, see the HIST_SAVE_BY_COPY option (which you should make
sure has not been unset).

You might also look at the setting of the HIST_FCNTL_LOCK option.