Which command is used to change the ownership of a file in Linux?

The command used to change the ownership of a file in Linux is chown. This command allows you to specify a new owner and, optionally, a new group for one or more files. By using chown, you can manage file permissions and ownership effectively, which is crucial for maintaining security and access control within a Linux system.

For example, if you want to change the ownership of a file called "example.txt" to a user named "user1," you would use the command chown user1 example.txt. This command directly modifies the ownership metadata associated with that specific file.

The other commands listed serve different purposes: chmod is used to change the file permissions, chgrp is specifically for changing the group ownership of a file, and mv is for moving or renaming files. Each of these commands plays an important role in file management, but only chown directly alters the ownership attributes of a file or directory.