[cobalt-security] RaQ4r: chkrootkit odd report: bash_history file size is 0

["Michelle A. Hoyle" <mahlist@xxxxxxxxxxxxx>]

I run chkrootkit every night and look at the results the next day. 
The most recent report had something odd in it:

> Searching for anomalies in shell history files... Warning: 
> `//root/.bash_history' file size is zero

And, if I check the .bash_history file, it is indeed 0 and doesn't 
seem to be writing anything into it.  If I do a "history", it starts 
off with item 0, with something from this session (but the 
.bash_history file is still empty).  Did this file get rotated out of 
existence because it finally got too big or where did it go?

Do I need to worry about this?

Thanks,

Michelle