Executes a command in the Windows command shell. :connect server[\instance -l timeout -U user -P password - Connects to a ...

:!! []   - Executes a command in the Windows command shell. :connect server[\instance] [-l timeout] [-U user [-P password]]   - Connects to a SQL Server instance. :ed   - Edits the current or last executed statement cache. :error    - Redirects error output to a file, stderr, or stdout. :exit   - Quits sqlcmd immediately. :exit()   - Execute statement cache; quit with no return value. :exit()   - Execute the specified query; returns numeric result. go []   - Executes the statement cache (n times). :help   - Shows this list of commands. :list   - Prints the content of the statement cache. :listvar   - Lists the set sqlcmd scripting variables. :on error [exit|ignore]   - Action for batch or sqlcmd command errors. :out |stderr|stdout   - Redirects query output to a file, stderr, or stdout. :perftrace |stderr|stdout   - Redirects timing output to a file, stderr, or stdout. :quit   - Quits sqlcmd immediately. :r    - Append file contents to the statement cache. :reset   - Discards the statement cache. :serverlist   - Lists local and SQL Servers on the network. :setvar {variable}   - Removes a sqlcmd scripting variable. :setvar     - Sets a sqlcmd scripting variable.