Append shell commands to history immediately

 When working with multiple terminals you can always face ssh timeout which will result in loss of command history of the particular session.

To prevent this, Add below line in "/etc/bash.bashrc" file

export PROMPT_COMMAND='history -a'

After logoff login, every time a shell command runs it will be immediately stored in history file.

That should do the trick!!!

Enable Timestamp in bash history for all users

Time Stamp in Linux history can save you from many tight corners.

To enable this, please add below line to "/etc/bash.bashrc" file

HISTTIMEFORMAT="%d-%h-%Y %T "

Logoff login will enable time stamp in history like below example

57  03-Jan-2013 07:15:22 history

That should do the trick!!!