Managing Access Permissions and Protection Mode in CNS

1. Access Permission and Protection mode

2. Access Permission and Protection mode • In CNS, access permission settings are required in order to avoid other users to access your files. • Protection mode can allow or deny other users to access privates files and directories. • Protection mode is a 3x3 combination of “who” and “what”, determining access permission or prohibition. • Who? • Owner of the file (user) • Member of group (group)* All students are in the same group • Other (other) • Can do what? • Read file(read) • Write to file (write) • Execute file (execute) ×

3. View and Change Protection Mode • Right-click on a directory or a file, then select “Get Info” in the menu. • There is “sharing and permission” section at the bottom of the info window. Click to choose

4. Point to notice when changing protection mode • You should be cautious when changing protection mode a directory • Protection mode of following directories should NOT be changed • Home directory • Permission for user to execute is required • If you change it, you might not be able to login • Maildir (Data of mail) • Permission for user to execute is required • If you change it, you might not be able to view e-mails