# export HISTTIMEFORMAT="%F %T `whoami` " >> /etc/profile

# history

……

  993  2014-02-14 11:26:02 root fdisk -l   994  2014-02-14 11:26:02 root df   995  2014-02-14 11:26:02 root ping 192.168.123.201   996  2014-02-14 11:26:02 root ls   997  2014-02-14 11:26:02 root ps -ef|grep ping   998  2014-02-14 11:26:02 root ping 192.168.123.201