Re: manually truncating histfile?

[Bart Schaefer <schaefer@xxxxxxxxxxxxxxxx>]

On Sat, Dec 28, 2024 at 10:06 AM Anthony Heading <ajrh@xxxxxxxx> wrote:
>
> I have SAVEHIST=0x4000000 to prevent the history file ever being automatically truncated before e.g. I can archive it.
>
> What's the best way then to explicitly truncate?

Something like this, I think:

truncate_histfile () {
  local SAVEHIST=0
  fc -W
}

This has to be run in an interactive shell.  Alternately, to just
write out the current shell history:

save_this_history () {
  local SAVEHIST=$HISTSIZE
  fc -W
}

Might require addition of some "setopt localoptions ..." to change the
state of history sharing/appending depending on what you enable and
what you want the resulting behavior to be.