history

To get history show time

echo 'export HISTTIMEFORMAT="%d/%m/%y %T "' >> ~/.bashrc
source  ~/.bashrc

1 2	echo 'export HISTTIMEFORMAT="%d/%m/%y %T "' >> ~/.bashrc source ~/.bashrc

history -a will append your current session history to the content of the history file.

history -w will replace the content of the history file with your current session history.