Expert Shell Scripting (Expert's Voice in Open Source) by Ron Peters

By Ron Peters

There are tens of hundreds of thousands of Linux and Unix procedure directors who're pressed for time and wish an instantaneous repair. specialist Shell Scripting deals speedy and simple suggestions to many universal (but hard) difficulties that may differently take hours to resolve. it is a e-book for those who comprehend shell scripting, yet don’t have the time to reinvent the wheel. And it really is distilled from greater than a decade of labor performed for Intel by way of a shell scripting guru.

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Extra resources for Expert Shell Scripting (Expert's Voice in Open Source)

Example text

Date in Days The following script shows one way to make date and time calculations much easier. Because UNIX and Linux calculate time based on a starting point of January 1, 1970, the script measures time in seconds since that date. Although the use of seconds may seem cumbersome, the math is simple, as you’ll see in the bit of code in the “Days Since Epoch” section of this chapter. You reduce the date and time values to numbers of seconds elapsed since the base date then manipulate these values.

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. org. CHAPTER 4 ■■■ Comparisons and Tests T wo of the fundamental types of operations in any programming language are the comparison and the test.

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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