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Linux.com: CLI for Noobies: Mother, May I?

Jan 27, 2004, 08:00 (0 Talkback[s])
(Other stories by Joe Barr)

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"There are few things as confusing, frustrating, and aggravating for those who come to Linux from Windows as the whole notion of permissions. Based on my own personal experience, I would say as much as 25% of the problems I've had using Linux over the years have been permissions related. It's a subject your mother didn't teach you, and you didn't learn on the playgrounds. That's why we're going to get down and dirty with the CLI today: to learn about permissions on Linux, right here, right now.

"Permissions are flags which control who can do what with a file. Which file? Any file on your system. For each file, there are three separate flags which indicate whether or not you can read a file, write a file, or execute a file. Just because you can do one, doesn't mean you can do the other two.

"Permissions are necessary for security. Because Linux is truly a multiuser system, it needs to protect each user's data from all the other users..."

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