OS: Unix: Documentation contains sites with documentation on using Unix or Unix-like operating systems, as well as the internal structure of Unix and Unix-like operating systems.
Unix tutorials, exercises and resources. Features on-line tests and training materials.
Ordering page for the Open Group's Single Unix Specification.
Contains operating system documentation, FAQ's and man pages.
Description of how the filesystem works internally.
Brian Kernighan's 1979 classic introduction to the facilities Unix offers, from the 7th Edition manual.
Source material from Bell Labs.
Contains RFC's and FAQ's.
Help site and portal documenting all major Unix distributions.
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