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Linux and Unix Shell Programming by David Tansley

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28.3. Bringing you up to speed on inittab

A run level directory consists of a collection of scripts that start off services. The word ‘services’ in this context means a demon, application, servers, subsystems or script process. A process called init (init is the father of all processes) is invoked during the boot process of the system. Part of its job is to see what services it should start, and what run level it should default to. It gets this information by looking at a text configuration file called inittab, located in /etc. Init also consults this file for loading specific processes. If you ever need to edit this file, make a backup first. If this file gets corrupted or there are ‘degrading’ errors the system will not boot normally; you ...

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