You could set a higher securelevel and use system flags like:
chflags sappnd .history
Which will prevent it from being erased and only allow appending.

On Tue, 31 Mar 2020 at 10:59, el kalin <ka...@el.net> wrote:

> hi all...
>
> noticed that over night the shell .history file for root was emptied. the
> file is there but there is no history in it. this is unusual and it's the
> second time it happens in 2 months. it's particularly peculiar since nobody
> else has the root password for this machine. i can't see any ssh access in
> auth.log and ssh access is limited to a handful of ips...  how could i
> figure out what is emptying the .history file?
>
> thanks...
>
> also, the .cshrc looks like this:
>
>     set promptchars = "%#"
>
>         set filec
>         set history = 1000
>         set savehist = (1000 merge)
>         set autolist = ambiguous
>         # Use history to aid expansion
>         set autoexpand
>         set autorehash
>         set mail = (/var/mail/$USER)
>         if ( $?tcsh ) then
>                 bindkey "^W" backward-delete-word
>                 bindkey -k up history-search-backward
>                 bindkey -k down history-search-forward
>         endif
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