Introduction to Operating Systems by Dr. Mark Humphrys
This note describes the following topics: UNIX or Linux, Pipes and redirection, Text editors, Case sensitivity, Filenames and Special Characters, UNIX file protections, UNIX directory protections, Shell, Shell utilities, Search engine, PC operating systems, Server operating systems, Mobile operating systems, OS structure, Processes, Memory, Files, Windows command line.
Author(s): Dr. Mark Humphrys
NA Pages 
xv6 a simple Unix like teaching operating system
This book contains below topics, Operating system interfaces, Operating system organization, Page tables, Traps and system calls, Page faults, Interrupts and device drivers, Locks, Scheduling, Sleep and wakeup, File system.
Author(s): Russ Cox, Frans Kaashoek, and Robert Morris, MIT CSAIL
116 Pages
Operating Systems Lecture Notes by Stanford University
This lecture note explains important systems concepts in general. Topics covered includes, Threads and Processes, Concurrency and Synchronization, Scheduling, Virtual Memory, I O, Disks, File systems, Network file systems, Protection and Security, Virtual machines, Cutting edge topics.
Author(s): Stanford University
NA Pages
