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The Linux permissions model
 1. One user, one group
2. Understanding "ls -l"
3. Three triplets
4. Who am I?
5. What groups am I in?
6. Changing user and group ownership
7. Recursive ownership changes
8. Introducing chmod
9. User/group/other granularity
10. Resetting permissions
11. Numeric modes
12. Numeric permission syntax
13. The umask
14. The umask, continued
15. Introducing suid and sgid
16. Introducing suid and sgid, continued
17. suid
18. suid/sgid caveats
19. Changing suid and sgid
20. Permissions and directories
21. Directories and sgid
22. Directories and deletion
23. The elusive first digit
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