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The command to change the ownership of a file in Linux is `chown`, which stands for "change owner." In this case, the command `chown bcassini /hr/payroll` effectively changes the ownership of the specified file, `/hr/payroll`, to the user `bcassini`. This is a fundamental operation in file management and ensures that the specified user has control over the file, enabling them to edit or manage it as needed.

The command syntax is clear and directly expresses the action of assigning ownership to a user. Ownership management is critical in a multi-user environment, as it helps define permissions and access levels for files. Therefore, using `chown` is the correct approach when you want to assign a file to a different user.

Other commands do not serve the purpose of changing file ownership. For instance, while `chgrp` changes the group ownership of a file, it does not affect the user ownership. The `chmod` command modifies the permissions associated with a file rather than its owner. Lastly, the `mv` command is used for moving or renaming files, which does not relate to altering ownership in any way.