Which command can you use in Linux to change file permissions?

The command used in Linux to change file permissions is "chmod." This command stands for "change mode," which reflects its functionality of modifying the permissions associated with files or directories. With chmod, you can define who can read, write, or execute a file by specifying permissions for the owner, group, and others.

For example, using chmod 755 filename assigns read, write, and execute permissions to the owner, and read and execute permissions to the group and others. This versatility makes chmod a foundational tool for managing file access within Linux systems and is essential for maintaining security and proper functionality.

The other options do not pertain to changing file permissions. "ls" is used for listing files and directories, "permissions" is not a valid command but rather a general term describing a file's access controls, and "change-mode" is not an existing command in Linux; it is a conceptual description of what chmod does. Each of these does not offer the capability to modify file permissions directly like chmod does.