The command ‘reg query’ is used to display the values of keys and sub keys in the registry in a Windows environment. It allows users to retrieve information about registry keys and their corresponding values.

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This use case is helpful when you need to retrieve all the values associated with a specific registry key. It provides a comprehensive list of all the values stored within that key.

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In some cases, you may only be interested in retrieving a specific value from a registry key, rather than all the values. This use case allows you to specify the value you want to retrieve.

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When you need to retrieve all the values of a registry key as well as its sub keys, this use case proves useful. It provides a more comprehensive view of the registry structure, including all values and sub keys.

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When you need to find specific keys or values in the registry that match a specific pattern, this use case becomes handy. It allows for filtering registry entries based on the provided search pattern.

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When you need to retrieve a specific value from a registry key that matches a certain data type, this use case is helpful. It allows you to filter the results based on the specified data type.

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The ‘reg query’ command is a powerful tool for retrieving information from the Windows registry. With its various options, such as querying specific values, searching for patterns, and filtering based on data types, it provides flexibility to meet different use cases. Whether you need to explore the registry hierarchy or extract specific data, this command enables efficient access to registry information.