List command line history with timestamp

HISTTIMEFORMAT takes format string of strftime. Check out the strftime manual to choose and construct the timestamp that suit your taste. My favorite is “%F %T “.


export HISTTIMEFORMAT="%F %T"

Execute history again and you will see the effect on the spot, bare in mind that the timestamp for command lines that executed at previous sessions may not valid, as the time was not tracked.
...
994 2008-10-16 02:27:40 exit
995 2008-10-16 01:12:20 iptables -nL
996 2008-10-16 01:47:46 vi .bash_profile
997 2008-10-16 01:47:55 history
998 2008-10-16 01:48:03 . .bash_profile
999 2008-10-16 01:48:04 history
1000 2008-10-16 01:48:09 exit
1001 2008-10-16 02:27:43 history
...

I would suggest you to put the export into ~/.bash_profile as well as /root/.bash_profile. In case you do not have .bash_profile, you can choose to put into ~/.bashrc.

Don’t mess up my servers! Your actions will be track!