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Evaluating for the Current Day and Time
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Say you want to schedule a job, such as a system monitor, to run at particular times or on certain days. You want to know whether there are issues on the system, but you don t necessarily want to be jarred awake by your pager simply to learn that the message is noncritical; you d like to get those routine notices by page during the day and by e-mail at other times. The following script determines whether the current day and hour are within a certain time frame that you set. This code would be called from another script, which actually performs the notifications. Two sets of day and hour parameters (for a total of four) are passed to the script when it is called. These parameters specify a range of days (Sunday through Monday) and a range of hours when pages may be sent during those days. The script returns a 0 if the current day and hour are within those parameters and gives the user a message stating the
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CHAPTER 3 DATE AND TIME MANIPULATION
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same. If the current day and hour values do not lie within the given range, a different message is output and the function returns a 1 (representing failure).
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#!/bin/sh if [ $# -ne 4 ] then echo Usage: $0 {day begin} {day end} {hour begin} {hour end} echo " Days are 0-6 where 0 is Sunday." echo " Hours are 0-23." exit fi
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The script starts by determining how many parameters have been sent to the script. Recall that four is the expected number. If four parameters haven t been sent, such as if the script calling this code were written incorrectly, you should output a usage message containing some explanation of how the script should be invoked. The usage explanation provided here shows that the four parameters that should be passed are DAY_BEGIN, DAY_END, HOUR_BEGIN, and HOUR_END. All of these values are integers in which the day values range from 0 6 where Sunday is 0, and the hours range from 0 23. If the parameter count is correct, the code assigns the parameters to variables with more meaningful names, such as DAY_BEGIN and DAY_END instead of 1 and 2. Making this change helps the readability and it is easier to see what is happening.
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DAY_BEGIN=$1 DAY_END=$2 HOUR_BEGIN=$3 HOUR_END=$4
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Next, the variables for the current day and hour need to be set.
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DAY=`date +%w` HOUR=`date +%H`
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The code here is the main check to determine whether it is time to notify the administrator. The large if statement compares the current DAY and HOUR values with the values that were passed to the script.
if [ $DAY -ge $DAY_BEGIN -a $DAY -le $DAY_END\ -a $HOUR -ge $HOUR_BEGIN -a $HOUR -le $HOUR_END ] then echo "It is time to notify" return 0 else echo "It is not time to notify" return 1 fi
CHAPTER 3 DATE AND TIME MANIPULATION
Note The valid day and hour ranges include the end points specified by the parameters. That is, if the
script was invoked with DAY values of 1 and 5, the test should succeed on Monday, Friday, and on the days in between.
In a real-world implementation, you would probably replace the echo lines with code for performing actual notification, such as a call to a paging utility such as QuickPage.1 As mentioned earlier, I ve assumed for simplicity that the actual notification is handled by the code that calls this script. That script might be an exhaustive monitoring utility that performs many types of monitoring tasks. Each monitor could call this script with different parameters based on the level of criticality. The calling script would then evaluate the return code by accessing the $ variable to determine whether to send a notification. To simplify this script, you could hard-code the DAY_BEGIN/DAY_END and HOUR_BEGIN/ HOUR_END ranges instead of assigning them the values of the passed parameters. You would then remove the validation check for the number of parameters passed.
1. QuickPage is an application that allows you to send messages to an alphanumeric pager. More information can be found at http://www.qpage.org.
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