Working with File Permissions and Ownership

Every file is owned by a User and a Group

Every file has permisisons for its User, its Group, and for Everyone Else

Processes are also owned by a User and by a Group

Annotated example of output from the ls -l command.
Annotation showing detail of what permission letters mean in output from ls -l.

Tasks:

• Compare how 'execute' permission applies to regular files and to directories.
  
• Why would it be a security problem to allow users to make files be owned by other users?