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Full Discussion: value of variable based on time of the day
Top Forums Shell Programming and Scripting value of variable based on time of the day Post 302306468 by cfajohnson on Monday 13th of April 2009 01:17:23 AM
Old 04-13-2009
Quote:
Originally Posted by TonyFullerMalv
Keep it simple method?

Code:
TESTHOUR=`date +%H`
TODAYSDATE=`date +%d`


That will fail if the date changes between the two calls to date; more reliable (and more efficient) is:

Code:
eval "$(date +"TESTHOUR=%H TODAYSDATE=%d")"

Quote:
Code:
if [ ${TESTHOUR} -ge 17 ]; then
  TIMENOW=${TODAYSDATE}
else
  TIMENOW=`expr ${TODAYSDATE} - 1`


First, there is no need to use expr; the Unix shell has arithmetic builtin:

Code:
TIMENOW=$(( $TODAYSDATE - 1 ))

However, that will fail if $TODAYSDATE is the first day of the month.
Quote:
Code:
fi
echo ${TIMENOW}

 

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LEARN ABOUT DEBIAN

weather::com::dayforecast

Weather::Com::DayForecast(3pm)				User Contributed Perl Documentation			    Weather::Com::DayForecast(3pm)

NAME

       Weather::Com::DayForecast - class representing a forecast for one day

SYNOPSIS

	 [...]

	 my @locations = $weather_finder->find('Heidelberg');

	 my $forecast = $locations[0]->forecast();
	 my $tomorrow = $forecast->day(1);

	 print "Forecast for tomorrow:
";
	 print " - tomorrow it's the ", $tomorrow->date()->date(), "
";
	 print " - sunrise will be at ", $tomorrow->sunrise()->time(), "
";
	 print " - maximum temperature will be ", $tomorrow->high(), "
";

DESCRIPTION

       Via Weather::Com::DayForecast objects one can access the weather forecast for one specific day.

       This class will not be updated automatically with each call to one of its methods. You need to call a method of your Weather::Com::Forecast
       object to get updated objects.

CONSTRUCTOR

       You usually would not construct an object of this class yourself.  This is implicitely done when you call the "day(number of day)" or the
       "all()" method of a Weather::Com::Forecast object.

METHODS

       date()

       Returns a Weather::Com::DateTime object containing the date the forecast is for.

       high()

       Returns the maximum temperature that will be reached at daytime.

       For day 0 (today), this will be 'N/A' when it's after noon...

       There is a bug in weather.com's date and time mathematics: If you are asking for a location's forecast day 0 and it's short after midnight,
       day 0 will be "yesterday" and you'll get both, yesterday's daytime forecast and night forecast!

       I have not investigated this issue further, yet. If anyone has, please inform me!

       low()

       Returns the minimum temperature that will be reached at night.

       sunrise()

       Returns a Weather::Com::DateTime object containing the time of sunrise.

       sunset()

       Returns a Weather::Com::DateTime object containing the time of sunset.

       day()

       Returns a Weather::Com::DayPart object with all data belonging to the daytime.

       For day 0 (today), this will be "undef" when it's after noon...

       There is a bug in weather.com's date and time mathematics: If you are asking for a location's forecast day 0 and it's short after midnight,
       day 0 will be "yesterday" and you'll get both, yesterday's daytime forecast and night forecast!

       I have not investigated this issue further, yet. If anyone has, please inform me!

       night()

       Returns a Weather::Com::DayPart object with all data belonging to the night.

AUTHOR

       Thomas Schnuecker, <thomas@schnuecker.de>

COPYRIGHT AND LICENSE

       Copyright (C) 2004-2007 by Thomas Schnuecker

       This library is free software; you can redistribute it and/or modify it under the same terms as Perl itself.

       The data provided by weather.com and made accessible by this OO interface can be used for free under special terms.  Please have a look at
       the application programming guide of weather.com (<http://www.weather.com/services/xmloap.html>)!

perl v5.8.8							    2007-07-09					    Weather::Com::DayForecast(3pm)
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