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..."