[Help-bash] counterpart of HISTIGNORE/HISTCONROL but only for saving to .bash_history

[the2nd]

hi,

is it possible to prevent bash from saving an command to the history 
file but still keeping it in the in-memory history of the current 
session?

this would be very useful if you need to run an "dangerous" command 
(e.g. mkfs) multiple times in your current session but dont want it in 
your history of any other session.

a real world scenario i often have is when migrating/testing ganeti 
instances. the device file is named something like 
/dev/system/ce48be69-be2f-422c-986f-9bdc6a29dc42.disk0 and if you need 
to run commands like mkfs or kpartx many times on it, it would be great 
to keep it in the history but only for the current session.

regards
the2nd