Some of the best documentation about the proc
file system is installed on the system by default.
/usr/share/doc/kernel-doc-<version>/Documentation/filesystems/proc.txt
— Contains assorted, but limited, information about all
aspects of the /proc/ directory.
/usr/share/doc/kernel-doc-<version>/Documentation/sysrq.txt
— An overview of System Request Key options.
/usr/share/doc/kernel-doc-<version>/Documentation/sysctl/
— A directory containing a variety of
sysctl tips, including modifying values that
concern the kernel (kernel.txt), accessing
file systems (fs.txt), and virtual memory use
(vm.txt).
/usr/share/doc/kernel-doc-<version>/Documentation/networking/ip-sysctl.txt
— A detailed overview of IP networking options.
