Linux File Permissions

Introduction
When you execute an “ls” command, you are not given any information about the security of the files, because by default “ls” only lists the names of files. You can get more information by using an “option” with the “ls” command. All options start with a ‘-‘. For example, to execute “ls” with the “long listing” option, you would type ls -l

When you do so, each file will be listed on a separate line in long format. There is an example in the window below.