tzselect命令用於選擇時區。要註意的是tzselect只是幫我們把選擇的時區顯示出來，並不會實際生效，也就是說它僅僅告訴我們怎麽樣去設置環境變量TZ。（TZ = Time Zone）（The tzselect program asks the user for information about the current location, and outputs the resulting time zone description to standard output. The output is suitable as a value for the TZ environment variable. All interaction with the user is done via standard input and standard error.）如果妳要永久更改時區，按照tzselect命令提示的信息，在.profile或者/etc/profile中設置正確的TZ環境變量並導出。還有另外壹種更改時區的方法就是直接更改系統配置文件/etc/sysconfig/clock，然後修改符號鏈接/etc/locatime對應的文件，詳見示例三。
常用參數
無。
使用示例
示例壹 將時區更改為北京
[root@new55 ~]# 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) east China – Beijing, Guangdong, Shanghai, etc.
2) Heilongjiang (except Mohe), Jilin
3) central China – Sichuan, Yunnan, Guangxi, Shaanxi, Guizhou, etc.
4) most of Tibet & Xinjiang
5) west Tibet & Xinjiang
#? 1
The following information has been given:
China
east China – Beijing, Guangdong, Shanghai, etc.
Therefore TZ=’Asia/Shanghai’ will be used.
Local time is now: Mon Dec 6 09:40:35 CST 2010.
Universal Time is now: Mon Dec 6 01:40:35 UTC 2010.
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
[root@new55 ~]#
現在要做的事情就是按照提示，把 TZ=’Asia/Shanghai’; export TZ 添加到.profile中（bash對應加到.bash_profile）。