Which command would you use to change user permissions in Linux?

The command used to change user permissions in Linux is chmod. This command allows you to modify the read, write, and execute permissions of files and directories for the user, group, and others. By using chmod, you can specify which users or groups are allowed to access, modify, or execute a file, providing granular control over file security.

Changing permissions is essential for managing access rights, ensuring that only authorized users can interact with certain files or directories as needed. For example, if a file is set to be readable and writable by the owner but only readable by group members and others, chmod allows you to set these specific permissions accordingly.

While the other commands listed have their own functions, they do not directly relate to changing permissions. chown is used to change the ownership of files and directories, passwd is employed to change a user's password, and su is used to switch user accounts in the terminal. Each of these commands serves different purposes in managing users and permissions within a Linux environment.