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The command "desc role ${role_name};" is used to describe or display the details of a specific role in a database system.
Here's a breakdown of the command:
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"desc": It is short for "describe", and it instructs the database system to provide the metadata or structure information about a specific database object.
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"role": It refers to a database role, which is a named group of database users with certain privileges and permissions.
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"${role_name}": This is a placeholder or variable that should be replaced with the actual name of the role you want to describe. For example, if you want to describe a role named "admin", you would use "desc role admin;".
Overall, this command allows you to retrieve information about a particular database role, such as the role name, role members, and any associated privileges or permissions.