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Windows Batch Scripting Variables Guide

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Basic Concepts: DOS doesn't require variable declaration, undeclared variables are empty strings
SET command assigns values to variables without whitespace
Lowercase names recommended for script variables, uppercase for system variables
SET always overwrites existing variables
Variable Scope: Variables are global by default, can be made local with SETLOCAL
SETLOCAL variables persist until ENDLOCAL or script exit
System-wide variables like %TEMP% should not be overwritten
Command Line Arguments: Command line arguments accessed using % followed by ordinal position
%0 represents script name, %1-9 represent command line arguments
SHIFT command needed for arguments above %10
Special macros available for file path manipulation
Best Practices: Include SETLOCAL and ENABLEEXTENSIONS at script top
Store script name in %me% variable
Use %parent% for script directory paths
Verify variable names don't overwrite system variables