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This topic describes how to test connectivity to an instance of SQL Server, use the sqlcmd utility.
To log in to the default instance of SQL Server
From a command prompt, enter the following command to connect by using Windows Authentication:
sqlcmd [ /E ] [ /S servername ]
To log in to a named instance of SQL Server
From a command prompt, enter the following command to connect by using Windows Authentication:
sqlcmd [ /E ] /S servername\instancename
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