...making Linux just a little more fun!
Ben Okopnik [ben at linuxgazette.net]
----- Forwarded message from "s. keeling" <[email protected]> -----
I've yet again just discovered that tomorrow morning is "spring forward Day", so this may be apropos:
alias dst="zdump -v Canada/Mountain | grep $(date '+%Y')"
Substitute your TZ for C/M, of course. Submit to 2cT?
-- * Ben Okopnik * Editor-in-Chief, Linux Gazette * http://LinuxGazette.NET *
Ben Okopnik [ben at linuxgazette.net]
On Sun, Mar 14, 2010 at 11:43:47PM -0400, Benjamin Okopnik wrote:
> ----- Forwarded message from "s. keeling" <[email protected]> ----- > > I've yet again just discovered that tomorrow morning is "spring > forward Day", so this may be apropos: > > alias dst="zdump -v Canada/Mountain | grep $(date '+%Y')" > > Substitute your TZ for C/M, of course.
Even that last part can be automated:
alias dst="zdump -v `cat /etc/timezone` | grep $(date '+%Y')"
-- * Ben Okopnik * Editor-in-Chief, Linux Gazette * http://LinuxGazette.NET *
Breen Mullins [breen.mullins at gmail.com]
* Ben Okopnik <[email protected]> [2010-03-15 02:31 -0400]:
> >Even that last part can be automated: > >`` >alias dst="zdump -v `cat /etc/timezone` | grep $(date '+%Y')" >'' >
For most of us that file should be /etc/localtime .
A large number of us had to worry about the time change on Sunday morning. The whole choir was there on time yesterday (!)
-- Breen Mullins <[email protected]>
Ben Okopnik [ben at okopnik.com]
On Mon, Mar 15, 2010 at 11:53:07AM -0700, Breen Mullins wrote:
> * Ben Okopnik <[email protected]> [2010-03-15 02:31 -0400]: > > > > >Even that last part can be automated: > > > >`` > >alias dst="zdump -v `cat /etc/timezone` | grep $(date '+%Y')" > >'' > > For most of us that file should be /etc/localtime .
Breen, are you sure? My /etc/localtime is the actual timezone data - binary info - rather than the TZ string.
-- * Ben Okopnik * Editor-in-Chief, Linux Gazette * http://LinuxGazette.NET *
Sam Bisbee [sbisbee at computervip.com]
On Mon, Mar 15, 2010 at 03:55:43PM -0400, Ben Okopnik wrote:
> On Mon, Mar 15, 2010 at 11:53:07AM -0700, Breen Mullins wrote: > > * Ben Okopnik <[email protected]> [2010-03-15 02:31 -0400]: > > > > > > > >Even that last part can be automated: > > > > > >`` > > >alias dst="zdump -v `cat /etc/timezone` | grep $(date '+%Y')" > > >'' > > > > For most of us that file should be /etc/localtime . > > Breen, are you sure? My /etc/localtime is the actual timezone data - > binary info - rather than the TZ string. >
Ditto - /etc/localtime is binary data and /etc/timezone is the string representation ("America/New_York").
Cheers,
-- Sam Bisbee
Breen Mullins [breen.mullins at gmail.com]
On Mon, Mar 15, 2010 at 12:55, Ben Okopnik <[email protected]> wrote:
> > Breen, are you sure? My /etc/localtime is the actual timezone data - > binary info - rather than the TZ string.
On Fedora, there's no /etc/timezone. Just /etc/localtime (which is the binary data file).
zdump -v /etc/localtime returns the expected output, though.
Aren't distributions fun?
-- Breen Mullins <[email protected]>
Ben Okopnik [ben at linuxgazette.net]
On Mon, Mar 15, 2010 at 03:25:06PM -0700, Breen Mullins wrote:
> On Mon, Mar 15, 2010 at 12:55, Ben Okopnik <[email protected]> wrote: > > > > Breen, are you sure? My /etc/localtime is the actual timezone data - > > binary info - rather than the TZ string. > > On Fedora, there's no /etc/timezone. Just /etc/localtime (which is the > binary data file).
I've just checked, and it pretty much what I recalled (Debian used to do it this way years ago): /etc/localtime is a link to the actual timezone data in /usr/share/zoneinfo. Not much help, there.
> zdump -v /etc/localtime returns the expected output, though.
Perhaps that depends on what is expected. 
ben@Jotunheim:~$ zdump -v America/New_York | grep $(date '+%Y') America/New_York Sun Mar 14 06:59:59 2010 UTC = Sun Mar 14 01:59:59 2010 EST isdst=0 gmtoff=-18000 America/New_York Sun Mar 14 07:00:00 2010 UTC = Sun Mar 14 03:00:00 2010 EDT isdst=1 gmtoff=-14400 America/New_York Sun Nov 7 05:59:59 2010 UTC = Sun Nov 7 01:59:59 2010 EDT isdst=1 gmtoff=-14400 America/New_York Sun Nov 7 06:00:00 2010 UTC = Sun Nov 7 01:00:00 2010 EST isdst=0 gmtoff=-18000 ben@Jotunheim:~$ zdump -v /usr/share/zoneinfo/EDT /usr/share/zoneinfo/EDT Fri Dec 13 20:45:52 1901 UTC = Fri Dec 13 20:45:52 1901 isdst=0 gmtoff=0 /usr/share/zoneinfo/EDT Sat Dec 14 20:45:52 1901 UTC = Sat Dec 14 20:45:52 1901 isdst=0 gmtoff=0 /usr/share/zoneinfo/EDT Mon Jan 18 03:14:07 2038 UTC = Mon Jan 18 03:14:07 2038 isdst=0 gmtoff=0 /usr/share/zoneinfo/EDT Tue Jan 19 03:14:07 2038 UTC = Tue Jan 19 03:14:07 2038 isdst=0 gmtoff=0 ben@Jotunheim:~$ zdump -v /usr/share/zoneinfo/EDT | grep $(date '+%Y') ben@Jotunheim:~$
Neither of the last two gives you the time switch-over point, which was, I think, Stephen's whole point.
> Aren't distributions fun?
Heh. I'm sure that there's a way to get the same thing on a
Fedora/CentOS system, but you're right: my adaptation of this script
will only work on systems that have a file containing that TZ string
(note that 'EST', etc., won't work; it has to be the 'Country/City'
variety.) His version is distro-independent, though - assuming that all
distros have 'zdump', of course.
-- * Ben Okopnik * Editor-in-Chief, Linux Gazette * http://LinuxGazette.NET *