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The command that reveals the names of all open shared files on a server, along with the number of file locks on each file, is indeed the "Net file" command. This command provides a detailed list of all the files that are currently open over the network and indicates how many locks are placed on each file. Understanding individual file locks is crucial for administrators managing network resources, as it helps in identifying potential contention issues and ensuring that users have appropriate access to shared files.

In contrast, the other commands serve different purposes. For example, "Net sessions" is used to view active sessions on the server that are connected to it, while "Net config" provides configuration details about the server or the workstation, and "Net share" displays information about shared resources but does not detail open files or file locks. Each command has its specific function and use case within network administration, making "Net file" the correct choice for obtaining the required information about open shared files and their locks.