chmod

`chmod` is a command used in Unix-like operating systems to change the permissions of files or directories. Permissions determine who can read, write, or execute a file. For example, you can set a file so only you can edit it, while others can only view or run it. Permissions are typically assigned to the owner, group, and others. Using `chmod`, you can specify these rights with numbers or letters to control access, ensuring security and proper sharing of files within a system.