Bash – Start bash session without history

bashcommand history

There are several options to disable saving commands to bash history e.g.

set +o history

unset HISTFILE

How to start a new bash session with history disabled?

I tried bash +o history but it didn't work.

EDIT: I don't want to modify my rc or profile files. I just want to start a single bash session with a different configuration.

bash --init-file <(echo '. ~/.bashrc; unset HISTFILE')

bash --rcfile <(echo '. ~/.bashrc; unset HISTFILE')

And better put it in ~/.bash_aliases as permanent alias:

alias bash2="bash --init-file <(echo '. ~/.bashrc; unset HISTFILE')"

Yes, put this in ~/.bashrc :

export HISTTIMEFORMAT='%F %T '

Then, run the following commands :

. ~/.bashrc
history

It will look like this :

 (...)
 5200  2012-09-30 23:55:37 find -printf '%Ts %f\n'
 5201  2012-10-01 00:00:58 ls
 5202  2012-10-01 00:03:45 cd
 (...)

Explanations of the output :

Add this line to .bashrc:

export PROMPT_COMMAND="history -a; history -n"

Open new terminal and check.

Explanation

history -a appends new history lines to history file.
history -n tells bash to read lines that is not read from history file to current history list of session.
PROMPT_COMMAND: contents of this variable is run as regular command before bash show prompt. So every time after you execute a command, history -a; history -n is executed, and your bash history is synced.