Titlebook

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Data Redirection and write operations. The forms and syntax of redirection are varied and their meanings are specific. I will cover some of the common uses here, and provide a bit more explanation than system man pages to aid you in avoiding pitfalls.

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cronule. Normally these tasks are performed on systems that run 24 hours a day, 7 days a week. Writing cron scripts to perform system maintenance, backups, monitors, or any other job that you would want to run on a schedule is a very common task. There are a few subtleties with cron however, that many users and administrators may be unaware of.

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Self-Linked Scriptsns all the code necessary to perform a number of tasks, but you may want to determine the specific task to be performed at runtime by calling the script by a specific name. This lets users invoke an individual task by name without having to learn specialized command-line switches for the options they want.

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Automating User Input with expectse. expect has much more functionality than I cover in this chapter, but this chapter provides a good example of how it can be used. To find more complete information, you can consult the expect manual page.

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Philosophy of Engineering and TechnologyIt is possible to set a normal (direct) variable in three ways:. In all of these cases, although you might not know a variable’s value in advance of any given point, you do know the name of the variable that is to receive the value.

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Indirect Reference VariablesIt is possible to set a normal (direct) variable in three ways:. In all of these cases, although you might not know a variable’s value in advance of any given point, you do know the name of the variable that is to receive the value.