The Initialization Process and Startup Scripts
This section describes how Linux starts and details the functions of the startup scripts used to prepare your system for use. An important concept to note is the use of various runlevels or Linux system states.
System states grew from the need to separate how the system ran according to the forms of maintenance being performed on a system. This is similar to performing a software or hardware upgrade on older PCs, which generally requires a reboot or shutdown and restart of the computer. These days, however, this practice is partially obviated through new software and hardware technologies. Hot-swappable hardware and software indicates that you can change hard drives, PC cards, or associated software ...
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