• Revise some comma usage
• Revise wording of some sentences
• Use <acronym> and <filename> tags
• Follow FDP on continuous repetition of &man.command.#;
• Write out numbers under 10
• Show an example of complete output of "ls -l" command
• Mention after successfully logging in, you will see the MOTD, and the command prompt
• Remove misleading comment about how chmod ### can only "set and assign" permissions, but not remove them.
• "CPU time evenly to each user" -> "CPU time fairly to each user"
• "permissions stored as two octets" -> "permissions stored as three octets"

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