What command is utilized to change the owner of a file or directory?

The command used to change the owner of a file or directory in Linux is "chown." This command allows you to specify the new owner's username or user ID followed by the file or directory name. For instance, executing "chown user1 myfile" will transfer ownership of "myfile" to the user "user1."

Understanding the other commands provides context for why "chown" is the right choice. The command "chgroup" is used to change the group ownership, specifically not the user's ownership, while "chmod" alters file permissions rather than ownership. "chowner" is not a valid command in Linux for changing ownership, making it irrelevant in this context. Thus, "chown" is the only suitable command among the options for changing the owner of a file or directory.