Q1
- 显示当前时间,格式:2016-06-18 10:20:30
- 显示前天是星期几
- 设置当前日期为2019-08-07 06:05:10
A1
date +"%F %T"
date -d '2 days ago' +%A
date 080706052019.10

Q2
- 在本机字符终端登录时,除显示原有信息外,再显示当前登录终端号,主机名和当前时间
A2
vim /etc/issue
\S
Kernel \r on an \m
# add below lines
# for beauty, include blank lines
Current TTY is: \l
Current hostname is: \n
Current time is: \t

Q3
- 今天20:50自动关机,并提示用户
A3
shutdown -P 20:50 "This server will be shut down at 20:50."

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