[Linux] 通过指令修改时区 tzselect
＃＃ 修改时区
tzselect 指令只是根据提示一步步选择正确时区，但不能真正修改时区，最后输入提示的指令，然后重启，才能永久修改。
sofency@ubuntu:~$ tzselect
Please identify a location so that time zone rules can be set correctly.
Please select a continent, ocean, "coord", or "TZ".
1) Africa
2) Americas
3) Antarctica
4) Asia
5) Atlantic Ocean
6) Australia
7) Europe
8) Indian Ocean
9) Pacific Ocean
10) coord - I want to use geographical coordinates.
11) TZ - I want to specify the time zone using the Posix TZ format.
#? 4
Please select a country whose clocks agree with yours.
1) Afghanistan 18) Israel 35) Palestine
2) Armenia 19) Japan 36) Philippines
3) Azerbaijan 20) Jordan 37) Qatar
4) Bahrain 21) Kazakhstan 38) Russia
5) Bangladesh 22) Korea (North) 39) Saudi Arabia
6) Bhutan 23) Korea (South) 40) Singapore
7) Brunei 24) Kuwait 41) Sri Lanka
8) Cambodia 25) Kyrgyzstan 42) Syria
9) China 26) Laos 43) Taiwan
10) Cyprus 27) Lebanon 44) Tajikistan
11) East Timor 28) Macau 45) Thailand
12) Georgia 29) Malaysia 46) Turkmenistan
13) Hong Kong 30) Mongolia 47) United Arab Emirates
14) India 31) Myanmar (Burma) 48) Uzbekistan
15) Indonesia 32) Nepal 49) Vietnam
16) Iran 33) Oman 50) Yemen
17) Iraq 34) Pakistan
#? 9
Please select one of the following time zone regions.
1) Beijing Time
2) Xinjiang Time
#? 1
The following information has been given:
China
Beijing Time
Therefore TZ='Asia/Shanghai' will be used.
Local time is now: Thu May 24 14:37:15 CST 2018.
Universal Time is now: Thu May 24 06:37:15 UTC 2018.
Is the above information OK?
1) Yes
2) No
#? 1
You can make this change permanent for yourself by appending the line
TZ='Asia/Shanghai'; export TZ
to the file '.profile' in your home directory; then log out and log in again.
Here is that TZ value again, this time on standard output so that you
can use the /usr/bin/tzselect command in shell scripts:
Asia/Shanghai
// 此时时区还没有修改成功
// 根据提示输入 TZ='Asia/Shanghai'; export TZ 但重启后又失效
sofency@ubuntu:~$ date
Wed May 23 23:37:03 PDT 2018
sofency@ubuntu:~$ sudo cp /usr/share/zoneinfo/Asia/Shanghai /etc/localtime
[sudo] password for aaron:
// 更新时间时，提示没有安装 ntpdate
sofency@ubuntu:~$ sudo ntpdate time.windows.com
sudo: ntpdate: command not found
// 安装
sofency@ubuntu:~$ sudo apt-get install ntpdate
// 更新时间
sofency@ubuntu:~$ sudo ntpdate time.windows.com
24 May 14:39:02 ntpdate[1449]: adjust time server 51.140.127.197 offset 0.044998 sec
sofency@ubuntu:~$ date
Thu May 24 14:38:08 CST 2018
// 重启
sofency@ubuntu:~$ sudo reboot
// 时区设置成功
sofency@ubuntu:~$ date
Thu May 24 14:41:10 CST 2018