EECS 1012 Lecture Notes - Lecture 22: System Administrator
13 Jun 2018
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EECS 1012 Lecture 22 Notes
Introduction
The Command Language Start-up Sequence Files
• The ability to branch and loop
• Notice that the ability to change variable values is important as a means of controlling
branches and ending loops.
• The ability to specify arguments with the command that executes the program and to
transfer those arguments into parameters and variables within the program
• The command script uses this technique to allow the user to specify the name of the file
to be backed up.
• The ability to detect an error that results from a command and recover from it in a
graceful way
• If the operating system attaches numerical values to its errors, the command program
can make decisions and branch based on the level of error.
• This could be used to determine if a particular file or a particular hardware component
exists, for example.
• A major use for a command language is the system start-up file.
• Most modern operating systems allow the execution of specific command files at
system start-up and also when a user logs in to the system.
• Two types of start-up files exist.
• One type is used to configure the basic operating system, as we discussed
• Start-up configuration files are only modified by the system administrator.
• The second type of start-up file is used to tailor the syste to the user’s prefereces.
• User start-up commands can be used to set various parameters
• Such as the preferred places to look for files, the type of terminal that the user is
working with, the selection of a command shell, and the appearance of the command
line prompt.
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