File Security. Viewing Permissions ls –l Permission Values.

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Presentation transcript:

File Security

Viewing Permissions ls –l

Permission Values

Permissions First character indicates file/directory 3 char. rwx User (Owner) permissions 3 char. rwx Group permissions 3 char. rwx Other (Public) permissions Permission Order of Precedence 1. User 2. Group 3. Other

Permission Examples

Permissions In Action

Default Permissions

The chmod Command Use chmod to change permissions on a file or directory. Two modes of operation –Relative (Symbolic) –Absolute (Octal)

chmod Symbolic Mode

chmod Octal Mode

Octal Values

Octal Default Permissions Default file permission –644 –rw-r--r-- Default directory permission –755 –rwxr-xr-x

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