小弟我使用过的Linux命令之tzselect - 选择时区

我使用过的Linux命令之tzselect - 选择时区
我使用过的Linux命令之tzselect - 选择时区

本文链接：http://codingstandards.iteye.com/blog/834280 ? （转载请注明链接）

　　tzselect命令用于选择时区。要注意的是tzselect只是帮我们把选择的时区显示出来，并不会实际生效，也就是说它仅仅告诉我们怎么样去设置环境变量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.）如果你要永久更改时区，按照tzselect命令提示的信息，在.profile或者/etc/profile中设置正确的TZ环境变量并导出。还有另外一种更改时区的方法就是直接更改系统配置文件/etc/sysconfig/clock，然后修改符号链接/etc/locatime对应的文件，详见示例三。

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[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 ~]#

现在要做的事情就是按照提示，把　TZ='Asia/Shanghai'; export TZ　　添加到.profile中（bash对应加到.bash_profile）。

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[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.
#? 2
Please select a country.
?1) Anguilla???????????????? 27) Honduras
?2) Antigua & Barbuda??????? 28) Jamaica
?3) Argentina??????????????? 29) Martinique
?4) Aruba??????????????????? 30) Mexico
?5) Bahamas????????????????? 31) Montserrat
?6) Barbados???????????????? 32) Netherlands Antilles
?7) Belize?????????????????? 33) Nicaragua
?8) Bolivia????????????????? 34) Panama
?9) Brazil?????????????????? 35) Paraguay
10) Canada?????????????????? 36) Peru
11) Cayman Islands?????????? 37) Puerto Rico
12) Chile??????????????????? 38) St Barthelemy
13) Colombia???????????????? 39) St Kitts & Nevis
14) Costa Rica?????????????? 40) St Lucia
15) Cuba???????????????????? 41) St Martin (French part)
16) Dominica???????????????? 42) St Pierre & Miquelon
17) Dominican Republic?????? 43) St Vincent
18) Ecuador????????????????? 44) Suriname
19) El Salvador????????????? 45) Trinidad & Tobago
20) French Guiana??????????? 46) Turks & Caicos Is
21) Greenland??????????????? 47) United States
22) Grenada????????????????? 48) Uruguay
23) Guadeloupe?????????????? 49) Venezuela
24) Guatemala??????????????? 50) Virgin Islands (UK)
25) Guyana?????????????????? 51) Virgin Islands (US)
26) Haiti
#? 47
Please select one of the following time zone regions.
?1) Eastern Time
?2) Eastern Time - Michigan - most locations
?3) Eastern Time - Kentucky - Louisville area
?4) Eastern Time - Kentucky - Wayne County
?5) Eastern Time - Indiana - most locations
?6) Eastern Time - Indiana - Daviess, Dubois, Knox & Martin Counties
?7) Eastern Time - Indiana - Pulaski County
?8) Eastern Time - Indiana - Crawford County
?9) Eastern Time - Indiana - Pike County
10) Eastern Time - Indiana - Switzerland County
11) Central Time
12) Central Time - Indiana - Perry County
13) Central Time - Indiana - Starke County
14) Central Time - Michigan - Dickinson, Gogebic, Iron & Menominee Counties
15) Central Time - North Dakota - Oliver County
16) Central Time - North Dakota - Morton County (except Mandan area)
17) Mountain Time
18) Mountain Time - south Idaho & east Oregon
19) Mountain Time - Navajo
20) Mountain Standard Time - Arizona
21) Pacific Time
22) Alaska Time
23) Alaska Time - Alaska panhandle
24) Alaska Time - Alaska panhandle neck
25) Alaska Time - west Alaska
26) Aleutian Islands
27) Hawaii
#? 27

The following information has been given:

??????? United States
??????? Hawaii

Therefore TZ='Pacific/Honolulu' will be used.
Local time is now:????? Sun Dec? 5 16:37:02 HST 2010.
Universal Time is now:? Mon Dec? 6 02:37:02 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='Pacific/Honolulu'; 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:
Pacific/Honolulu
[root@new55 ~]#
[root@new55 ~]# cat /etc/sysconfig/clock
# The ZONE parameter is only evaluated by system-config-date.
# The timezone of the system is defined by the contents of /etc/localtime.
ZONE="Asia/Shanghai"
UTC=true
ARC=false
[root@new55 ~]#

注意：tzselect命令只告诉你选择的时区的写法，并不会生效。所以现在它还是东8区北京时间。

[root@new55 ~]# date -R
Mon, 06 Dec 2010 10:46:11 +0800
[root@new55 ~]#

[root@new55 ~]# TZ='Pacific/Honolulu'; export TZ
[root@new55 ~]# date -R
Sun, 05 Dec 2010 16:46:44 -1000
[root@new55 ~]#

[root@new55 ~]# exit
logout
重新登录TZ就没有了。
Last login: Mon Dec? 6 09:39:30 2010 from 192.168.6.106
[root@new55 ~]# echo $TZ

[root@new55 ~]#

[root@new55 ~]# cat /etc/sysconfig/clock
# The ZONE parameter is only evaluated by system-config-date.
# The timezone of the system is defined by the contents of /etc/localtime.
ZONE="Asia/Shanghai"
UTC=true
ARC=false
[root@new55 ~]#

修改linux系统时区
??? 1) 可修改/etc/sysconfig/clock
??? ??? ZONE=Asia/Shanghai （ 查/usr/share/zoneinfo 下面的文件。 ）
??? ??? UTC=false （ 硬件时钟是否为 UTC 或者说 GMT 时钟。 ）
??? ??? ARC=false （如果是在 Alpha 机器上，则设置为 true 。 ）
??? （把硬件时钟设置为 UTC 的好处就是他能自动设置夏时制，缺点是，在安装有多重操作系统启动的机器上，在另外的操作系统上时钟会错误。 ）
??? 2) rm /etc/localtime
??? ??? Zhy: 这个文件是个符号链接？如果是在系统安装时就设置好的话，就是个普通文件。
??? 3) 以上海为例：
??? ??? ln -sf /usr/share/zoneinfo/Asia/Shanghai /etc/localtime

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【1】卓越资源? Linux操作系统时间设置方法介绍???
【2】懒人运维? Linux时间和时区查看与设置

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