Linux From ScratchThis Forum is for the discussion of LFS.
LFS is a project that provides you with the steps necessary to build your own custom Linux system.
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Chapter 7 has a short introduction on how the scripts with LFS are used (the sysv ones). But the best way to understand how the scripts work is just sit down for an hour or two and read through the scripts and learn how it's done. After having installed an LFS system for potentially a few days I'm sure it's not that big a deal to take a bit more time to understand the scripts now.
Basically Sysv employs a runlevel scheme and what needs to be done in the runlevels depends on the symbolic links in the /etc/rc.d/rc?.d directories (where ? represents a runlevel). All this is controlled by the /etc/rc.d/init.d/rc script, so you need to start there. This rc script is the parent, or master script, that does all the runlevel changing and running the different scripts upon entering/leaving runlevels.
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