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File Permissions - Coggle Diagram
File Permissions
Mode Structure
Structure of file mode bits.
file permission bits
which control ordinary access to the file
special mode bits,
which affect only some files
There are three kinds of permissions that a user can have for a file:
permission to read the file.
For directories, this means permission to list the contents of the directory.
permission to write to (change) the file.
For directories, this means permission to create and remove files in the directory.
permission to execute the file (run it as a program).
For directories, this means permission to access files in the directory.
There are three categories of users
the file’s owner;
other users who are in the file’s group;
everyone else.
The file mode bits have three special components
The set-user-ID bit (setuid bit).
The set-group-ID bit (setgid bit)
The restricted deletion flag or sticky bit.
Symbolic Modes
Mnemonic representation of file mode bits.
Numeric Modes
File mode bits as octal numbers.
Operator Numeric Modes
ANDing, ORing, and setting modes octally.
Directory Setuid and Setgid
Set-user-ID and set-group-ID on directories.