Execute a terminal command without saving it to .bash_history on OS X?
Solution 1:
Add the following line to ~/.bashrc
export HISTCONTROL=ignorespace
Then source ~/.bashrc to refresh the settings
This should enable that feature in bash. If it doesn't work, you might have to add it to ~/.bash_profile instead of ~/.bashrc since OS X loads them a bit differently than linux I think.
Solution 2:
If you're not concerned about keeping the session active, this may work:
kill -9 $$
It will kill the current session instead of logging-out, which [theoretically] means your history will not be saved.