SQLCMD is already installed within the container. You can use it from the Terminal tab, using the bash shell. For example, you can execute a SQL Script. This example creates a new Northwind database ...
copy "C:\SSIS2016Cookbook\Chapter10\Starter\SSISCustomization\SSISCustomTasks\bin\Release\SSISCustomTasks.dll" "C:\Program Files\Microsoft SQL Server\130\DTS\Tasks ...