默认的history是没时间戳，通过设置变量可能添加时间戳
#export HISTTIMEFORMAT="%F %T `whoami` "
# history
553 2015-06-04 10:05:53 root cd
554 2015-06-04 10:05:53 root cd python/
555 2015-06-04 10:05:53 root ll
556 2015-06-04 10:05:53 root cd Python-3.4.3
557 2015-06-04 10:05:53 root ll
558 2015-06-04 10:05:53 root ./configure
559 2015-06-04 10:05:53 root make
560 2015-06-04 10:05:53 root make install
561 2015-06-04 10:05:53 root python -v
562 2015-06-04 10:05:53 root rpm -qa | grep python
563 2015-06-04 10:05:53 root thon-pycurl-7.19.0-8.el6.x86_64
564 2015-06-04 10:05:53 root python-kerberos-1.1-6.2.el6.x86_64
565 2015-06-04 10:05:53 root python-krbV-1.0.90-3.el6.x86_64
566 2015-06-04 10:05:53 root libproxy-python-0.3.0-4.el6_3.x86_64
567 2015-06-04 10:05:53 root python-iwlib-0.1-1.2.el6.x86_64
568 2015-06-04 10:05:53 root gnome-python2-2.28.0-3.el6.x86_64