Date change related query Post: 27583

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Top Forums UNIX for Dummies Questions & Answers Date change related query Post 27583 by auswipe on Wednesday 4th of September 2002 12:28:23 AM

09-04-2002

Registered User

Re: Date change related query

Quote:

Originally posted by franklo
Meaning...I need a simple unix script that I can run as crone that takes as variable the url of another server and makes my server's time that of the other server plus 2 seconds. So if it is there 9:00 pm, my server's time becomes 21:00:02

Hmmm. At first I thought this was going to be a humdinger. This is how I solved the problem of having offset time by +2 seconds:

Code:

set -- `date -v +2S`
date ` echo $4 | sed -e 's/:/ /g' | awk '{printf("%s%s.%s\n", $1, $2, $3);}'`

Give it a try, your mileage may vary. I checked this out on a FreeBSD 4.5 system. This should be in your cronjob shell script right after sync'ing the time of the box. You will probably lose several tenths of a second. I don't know how accurate you have to have your clock sync'd to the server and this might be of some consideration.

Another important note is to not execute the cronjob near midnight. If for some reason the time sync'd at 23:59:59 the above shell script would be bad as the actual date wouldn't change, but the time would be 00:00:01 of the same day, effectively setting the time back almost 24 hours.

Last edited by auswipe; 09-04-2002 at 01:34 AM..

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rotatelogs

rotatelogs(8)						      System Manager's Manual						     rotatelogs(8)

NAME

       rotatelogs - rotate Apache logs without having to kill the server

SYNOPSIS

       rotatelogs logfile rotationtime [offset]

DESCRIPTION

       rotatelogs is a simple program for use in conjunction with Apache's piped logfile feature, which can be used like this:

       CustomLog "|bin/rotatelogs /var/logs/logfile 86400" common

       This  creates  the files /var/logs/logfile.nnnn where nnnn is the system time at which the log nominally starts (this time will always be a
       multiple of the rotation time, so you can synchronize cron scripts with it).  At the end of each rotation time (here after 24 hours) a  new
       log is started.

OPTIONS

       logfile
	      The  path plus basename of the logfile.  If logfile includes any Otherwise, the suffix .nnnnnnnnnn is automatically added and is the
	      time in seconds.	Both formats compute the start time from the beginning of the current period.

       rotationtime
	      The rotation time in seconds.

       offset The number of minutes offset from UTC.  If omitted, zero is assumed and UTC is used.  For example, to use local time in the zone UTC
	      -5 hours, specify a value of -300 for this argument.

PORTABILITY

       The  following logfile format string substitutions should be supported by all strftime(3) implementations, see the strftime(3) man page for
       library-specific extensions.

       %A     full weekday name (localized)

       %a     3-character weekday name (localized)

       %B     full month name (localized)

       %b     3-character month name (localized)

       %c     date and time (localized)

       %d     2-digit day of month

       %H     2-digit hour (24 hour clock)

       %I     2-digit hour (12 hour clock)

       %j     3-digit day of year

       %M     2-digit minute

       %m     2-digit month

       %p     am/pm of 12 hour clock (localized)

       %S     2-digit second

       %U     2-digit week of year (Sunday first day of week)

       %W     2-digit week of year (Monday first day of week)

       %w     1-digit weekday (Sunday first day of week)

       %X     time (localized)

       %x     date (localized)

       %Y     4-digit year

       %y     2-digit year

       %Z     time zone name

       %%     literal `%'

SEE ALSO

       httpd(8)

								    March 2001							     rotatelogs(8)

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