Overview of the SQLCMD utility in SQL Server

How to use SQLCMD commands in the SSMS query editor - SQL Shack

SQL COMMANDS

SQL Commands Cheat Sheet - Learn SQL Commands in One Go

Introduction to SQL Server's sqlcmd utility

Execute SQL Server Script Files with the sqlcmd Utility

SQL Commands: The Complete List (w/ Examples) – Dataquest

MySQL Commands: List & Examples

Working with PowerShell’s Invoke-SqlCmd