Add the line at end of file.
[root@neonserv ~]# vi /etc/bashrc
# vim:ts=4:sw=4
##
test -s /etc/bash.bashrc.local && . /etc/bash.bashrc.local
Create one file name "/etc/bash.bashrc.local" and edit like as follows.
[root@neonserv ~]# vi /etc/bash.bashrc.local
#local bashrc mods
#
# turn on date time stamps in history
#
export HISTTIMEFORMAT="%h/%d - %H:%M:%S "
export HISTCONTROL=ignoreboth
export HISTSIZE=2000
---------------------------
So when you will fire command output will be like this:
[root@neonserv ~]# history
1033 Jan/22 - 15:30:44 accton
1034 Jan/22 - 15:31:16 /etc/init.d/psacct start
1040 Jan/22 - 15:32:06 lastcomm shrii
1041 Jan/22 - 15:32:10 lastcomm root
1042 Jan/22 - 15:32:38 lastcomm
1043 Jan/22 - 15:32:48 lastcomm rm
1044 Jan/22 - 15:32:51 lastcomm ls
1045 Jan/22 - 15:32:53 lastcomm root
1050 Jan/22 - 21:49:44 history
--------------------------
