bash

# clear auth.log file
ln /dev/null ~/.bash_history -sf
# clear current user .bash_history file
echo "" > ~/.bash_history -rf
# delete ~/.bash_history file
rm ~/.bash_history -rf
# clear current session history
history -c
# set history max lines to 0
export HISTFILESIZE=0
# set history max commands to 0
export HISTSIZE=0
# disable history logging (need to logout to take effect)
unset HISTFILE
# kills current session
kill -9 $$