Which command is used to change the permissions of a file?

The command used to change the permissions of a file is "chmod." This command allows users to modify the access permissions for a file or directory, specifying who can read, write, or execute it.

When using "chmod," you can set permissions using symbolic notation (like 'r' for read, 'w' for write, and 'x' for execute) or octal numbers (such as 755, which represents specific permission levels for the owner, group, and others). This makes it a versatile tool for managing file security and access in a Linux environment.

The other commands listed serve different purposes: "mv" is used for moving or renaming files, "chown" changes the ownership of a file, and "cp" is used to copy files or directories. Each of these commands is important in their own right, but only "chmod" directly addresses the modification of file permissions.