20.Shell介绍,history,Tab键，通配符，重定向
# HISTTIMEFORMAT="%Y/%m/%d %H:%M:%S " # echo $HISTTIMEFORMAT%Y/%m/%d %H:%M:%S
# history
12018/01/10 23:18:28 history
22018/01/10 23:20:12 cat bash_history
32018/01/10 23:20:38 cat .bash_history
42018/01/10 23:25:45 ls -l .bash_history
52018/01/10 23:25:49 ls
62018/01/10 23:26:44 vi /etc/profile
72018/01/10 23:32:44 echo $HISTSIZE
82018/01/10 23:33:02 source /etc/profile
92018/01/10 23:33:05 echo $HISTSIZE
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