If you add that command to your .profile in /home/username, it will execute every time you log on. These lines are in my .profile to change my default editor setting and some HISTORY settings at login.
> grep '^export' /home/gene/.profile
export EDITOR=/usr/bin/vim
export HISTTIMEFORMAT='%F %T '
export HISTCONTROL=erasedups
export HISTSIZE=100000
Regards,
Gene