Re: How to keep HISTFILE variable untouched

[Roman Perepelitsa <roman.perepelitsa@gmail.com>]

On Thu, Aug 17, 2023 at 11:28 AM Budi <budikusasi@gmail.com> wrote:
>
> At the end of
>
>  % history -p
>
> The HISTFILE variable is cleaned up
>
> So how to keep HISTFILE variable remain untouched on any case ?

You can invoke `history -pa` from a function, or pass $HISTFILE as an
argument. What you should do depends on what you are trying to
achieve. From the docs:

    fc -p [ -a ] [ filename [ histsize [ savehistsize ] ] ]

    `fc -p' pushes the current history list onto a stack  and
    switches to a new history list.  If the -a option is also
    specified, this history list will be automatically popped
    when  the  current  function  scope is exited, which is a
    much better solution than creating  a  trap  function  to
    call  `fc  -P'  manually.  If no arguments are specified,
    the history list is left empty, $HISTFILE is  unset,  and
    $HISTSIZE  &  $SAVEHIST  are set to their default values.
    If one argument  is  given,  $HISTFILE  is  set  to  that
    filename,  $HISTSIZE  & $SAVEHIST are left unchanged, and
    the history file is read in (if it exists) to  initialize
    the  new  list.   If  a  second  argument  is  specified,
    $HISTSIZE & $SAVEHIST  are  instead  set  to  the  single
    specified numeric value.  Finally, if a third argument is
    specified, $SAVEHIST is set  to  a  separate  value  from
    $HISTSIZE.   You  are  free  to  change these environment
    values for the new history list  however  you  desire  in
    order to manipulate the new history list.

Roman.