countdown to christmas Post: 302310073

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Top Forums Shell Programming and Scripting countdown to christmas Post 302310073 by jim mcnamara on Thursday 23rd of April 2009 04:08:13 PM

04-23-2009

Registered User

This script uses Julian Days. This is overkill if you have GNU date (Linux)

Code:

#!/bin/ksh

jd=0
fraction=0

JD() # $1==day $2=month $3=year
{
   
    day=$1
    month=$2
    year=$3
	jd=0
	if [[ $month -lt 3 ]] ; then
	   year=$(( $year - 1 ))
	   month=$(( $month + 12 ))
	fi
	a=$(( $year / 100 ))
	b=$(( $a / 4 ))
	c=$(( 2 - $a + $b ))
	e=$(echo "365.25 * ( 4716 + $year ) " | bc -l)
    f=$(echo "30.6001 * ( $month + 1)" | bc -l )
    if [[ $year -gt 1581 ]] ; then
        jd=$(( $c + $day + $e + $f ))
    	jd=$( echo "$jd  - 1524.5" | bc -l )
    fi
    export jd
}


hr=$(( $(date "+%H") * 3600 ))
min=$(( $(date "+%M") *60   ))
sec=$(date "+%S")
fraction=$( echo "$hr/86400 + $min/86400  + $sec/86400"| bc -l)

JD $( date "+%d %m %Y" )
today=$( echo "$jd + $fraction" | bc -l)

yr=$( date "+%Y" )
JD 25 12 $yr
xmas=$jd    
difference=$(( $xmas - $today ))

if [[ $difference -lt 0 ]] ; then 
	yr=$(( $yr + 1 ))
	JD 25 12 $yr
	xmas=$jd
    difference=$(( $xmas - $today ))
fi
echo "Days to Christmas: $difference"

jim mcnamara

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atf-sh

ATF-SH(1)						    BSD General Commands Manual 						 ATF-SH(1)

NAME

     atf-sh [-s shell] -- interpreter for shell-based test programs

SYNOPSIS

     atf-sh script

DESCRIPTION

     atf-sh is an interpreter that runs the test program given in script after loading the atf-sh(3) library.

     atf-sh is not a real interpreter though: it is just a wrapper around the system-wide shell defined by ATF_SHELL.  atf-sh executes the inter-
     preter, loads the atf-sh(3) library and then runs the script.  You must consider atf-sh to be a POSIX shell by default and thus should not
     use any non-standard extensions.

     The following options are available:

     -s shell	  Specifies the shell to use instead of the value provided by ATF_SHELL.

ENVIRONMENT

     ATF_LIBEXECDIR    Overrides the builtin directory where atf-sh is located.  Should not be overridden other than for testing purposes.
     ATF_PKGDATADIR    Overrides the builtin directory where libatf-sh.subr is located.  Should not be overridden other than for testing purposes.
     ATF_SHELL	       Path to the system shell to be used in the generated scripts.  Scripts must not rely on this variable being set to select a
		       specific interpreter.

EXAMPLES

     Scripts using atf-sh(3) should start with:

	   #! /usr/bin/env atf-sh

     Alternatively, if you want to explicitly choose a shell interpreter, you cannot rely on env(1) to find atf-sh.  Instead, you have to hardcode
     the path to atf-sh in the script and then use the -s option afterwards as a single parameter:

	   #! /path/to/bin/atf-sh -s/bin/bash

ENVIRONMENT

     ATF_SHELL	  Path to the system shell to be used in the generated scripts.

SEE ALSO

     atf-sh(3)

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