Which command should be used to change the permissions of a file?

The command used to change the permissions of a file is "chmod." This command is primarily utilized in Unix-like operating systems, such as Linux and macOS. The "chmod" command allows users to modify the access rights associated with a file or directory, specifying who can read, write, or execute the file.

Permissions are crucial for maintaining security and control over files, as they determine which users are allowed to perform certain actions. By specifying the desired permission settings, users can protect sensitive information or restrict access to files.

In contrast, "ps" is a command used to display information about running processes, making it unrelated to file permissions. "chown," while relevant to file management, is specifically used to change the ownership of a file; it does not modify permissions directly. "NTFS" refers to a file system used by Windows operating systems that supports file permissions, but it is not a command for changing permissions. Therefore, "chmod" is the correct choice as it directly pertains to the task of changing file permissions.