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Top Forums Shell Programming and Scripting How to configure time zone using POSIX format in Centos 5? Post 302737005 by kalpeer on Wednesday 28th of November 2012 09:55:58 AM
Old 11-28-2012
How to configure time zone using POSIX format in Centos 5?

I was in process of developing a new script to configure a time zone. After some study I got the unix utility /usr/bin/tzselect to get the user inputs. Now I am able to configure the time zone depending on the user inputs except for the POSIX format.

Code:
root >/usr/bin/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
#? 2

The following information has been given:

    Antigua & Barbuda

Therefore TZ='America/Antigua' will be used.
Local time is now:    Wed Nov 28 04:00:31 AST 2012.
Universal Time is now:    Wed Nov 28 08:00:31 UTC 2012.
Is the above information OK?
1) Yes
2) No
#? y
Please enter 1 for Yes, or 2 for No.
#? 1

You can make this change permanent for yourself by appending the line
    TZ='America/Antigua'; 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:
America/Antigua
root >



This utility /usr/bin/tzselect provide an option to give a POSIX time format. Suppose if a user provide the posix format as GMT-14 then how do I configure the time zone? I am using Centos 5.
 

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lx(5)							Standards, Environments, and Macros						     lx(5)

NAME
lx - Linux branded zone DESCRIPTION
The lx brand uses the branded zones framework described in brands(5) to enable Linux binary applications to run unmodified on a machine with a Solaris Operating System kernel. The lx brand includes the tools necessary to install a CentOS 3.x or Red Hat Enterprise Linux 3.x distribution inside a non-global zone. The brand supports the execution of 32-bit Linux applications on x86/x64 machines running the Solaris system in either 32-bit or 64-bit mode. Supported Linux Distributions The lx brand emulates the system call interfaces provided by the Linux 2.4.21 kernel, as modified by Red Hat in the RHEL 3.x distributions. This kernel provides the system call interfaces consumed by the glibc version 2.3.2 released by Red Hat. In addition, the lx brand partially emulates the Linux /dev and /proc interfaces. Configuration and Administration The lx brand supports the whole root non-global zone model. All of the required linux packages are installed into the private file systems of the zone. The zonecfg(1M) utility is used to configure an lx branded zone. Once a branded zone has been installed, that zone's brand cannot be changed or removed. The zoneadm(1M) utility is used to report the zone's brand type and administer the zone. The zlogin(1) utility is used to log in to the zone. Application Support The lx zone only supports user-level Linux applications. You cannot use Linux device drivers, Linux kernel modules, or Linux file systems from inside an lx zone. You cannot add any non-standard Solaris devices to a Linux zone. Any attempt to do so will result in a zone that zonecfg(1M) will refuse to verify. You cannot run Solaris applications inside an lx zone. Solaris debugging tools such as DTrace (see dtrace(1M)) and mdb (see mdb(1)) can be applied to Linux processes executing inside the zone, but the tools themselves must be running in the global zone. Any core files generated are produced in the Solaris format, and such files can only be debugged with Solaris tools. ATTRIBUTES
See attributes(5) for a description of the following attributes: +-----------------------------+-----------------------------+ | ATTRIBUTE TYPE | ATTRIBUTE VALUE | +-----------------------------+-----------------------------+ |Availability |SUNWlxr, SUNWlxu | +-----------------------------+-----------------------------+ |Interface Stability |Evolving | +-----------------------------+-----------------------------+ SEE ALSO
mdb(1), zlogin(1), zonename(1), dtrace(1M), zoneadm(1M), zonecfg(1M), brands(5), zones(5), lx_systrace(7D) SunOS 5.11 19 Sep 2006 lx(5)
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