tzselect

选择系统所在时区。
有时候服务器在全球各地，虽然安装地点不一样，时区已经自动设置好，但是希望显示的时候按照亚洲时区来显示，好知道什么时间发生了什么事。

查看系统时间，发现是西5区

root@ubuntu:~# date -R
Wed, 13 Feb 2019 03:42:38 -0500

root@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
#? 13

The following information has been given:

        Hong Kong

Therefore TZ='Asia/Hong_Kong' will be used.
Selected time is now:   Wed Feb 13 16:47:13 HKT 2019.
Universal Time is now:  Wed Feb 13 08:47:13 UTC 2019.
Is the above information OK?
1) Yes
2) No
#? 1

You can make this change permanent for yourself by appending the line
        TZ='Asia/Hong_Kong'; 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/Hong_Kong

并没有起效果，系统提示，要想永久修改，在~/.profile后面追加一行
TZ='Asia/Hong_Kong'; export TZ
追加之后，退出重新登录

root@ubuntu:~# date -R
Wed, 13 Feb 2019 16:52:00 +0800
root@ubuntu:~#

发现已经变成了东8区