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The Ludic Impulse in Post-Postmodern Fictionule. 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 u

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Jeroen Groenendijk,Floris Roelofsenns 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 the

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The , and Agostini’s Utopianismty to recall and modify previous commands quickly and efficiently is beneficial. In the old DOS days, a utility called . would keep your history in a buffer. You could go back or forth through the command history one command at a time by using the up and down arrow keys. Individual commands could be

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Notizenaus den Ietzten Lebensjahren,se. 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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Shell Script Debuggingis one of them. Debugging code is a significant part of writing code. No matter how disciplined you are or how skilled you become at coding, you will have bugs in your code, in the form of either syntax or logic errors. The syntactical problems tend to be simpler to resolve since many times they sho

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Standard Function Libraryplicated functions again, and other times I would copy and paste the code from an earlier script. But the best coding practice is to keep a file around that contains all of your already tested and working functions. This creates a scriptwriter’s toolbox, or, in programming speak, a library. With a l

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Date and Time Manipulationbecause there are precise numbers of seconds, minutes, and hours in a day. It gets tricky, though, when you consider the fact that values have to roll over when, for example, Monday turns into Tuesday or June becomes July.

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Comparisons and Testsatements (if/then and case) and iteration statements (while). They give you the ability to examine relationships between data items, such as files, variables, strings, and numeric values, and to take action based on the result. You can also carry out actions based on the attributes of a particular i