Permission
Permissions in Linux plays an important part in administration as well as application configuration.
Whether you are a system administrator or a developer, it is mandatory to understand how permissions work in Linux systems.
Linux file permissions are a set of rules that determine who can access, modify, and execute files and directories on the system.
Displayed using the ls -l command in the terminal :
Types of Permissions:
Read (r): Allows a user to view the contents of a file or directory.
Write (w): Allows a user to modify or delete a file or directory.
Execute (x): Allows a user to run a file as a program or execute a directory as a script.
User, Group and Others (UGO) :
User: The user who owns the file or directory.
Group: Users who are part of the file's or directory's group.
Others: All other users who are not the owner or part of the group
Permissions Representation:
Read, write, and execute permissions can also be represented using octal notation.
Read (r): 4
Write (w): 2
Execute (x): 1
Combining Permissions: Permissions can be combined by adding their octal values.
For example, if a file has read, write, and execute permissions, it is represented as 7 (4 + 2 + 1 = 7).
Commands :