1、tzselect命令
交互式选择的方式，来选择时区，但试验实际操作中，并未立即生效，重启也无效。
# tzselect
Please identify a location so that time zone rules can be set correctly.
Please select a continent or ocean.
1) Africa
2) Americas
3) Antarctica
4) Arctic Ocean
5) Asia
6) Atlantic Ocean
7) Australia
8) Europe
9) Indian Ocean
10) Pacific Ocean
11) none - I want to specify the time zone using the Posix TZ format.
#? 5
Please select a country.
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: Wed May 19 11:23:12 CST 2021.
Universal Time is now: Wed May 19 03:23:12 UTC 2021.
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/Shanghai2、替换/etc/localtime的软链接指向
这个实际测试是立即生效的。
# date
Tue May 18 23:27:48 EDT 2021
# ls -l /etc/localtime
lrwxrwxrwx. 1 root root 38 Apr 29 07:37 /etc/localtime -> ../usr/share/zoneinfo/America/New_York
# ln -s /usr/share/zoneinfo/Asia/Shanghai /etc/localtime
ln: failed to create symbolic link ‘/etc/localtime’: File exists
# ln -s -f /usr/share/zoneinfo/Asia/Shanghai /etc/localtime # -f强制
# date
Wed May 19 11:28:09 CST 20213、增加TZ变量
# vim /etc/profile
export TZ='Asia/Shanghai' # source或者重新登录shell生效
