T-SQL Generate attach and detach database script for all User Databases On a SQL Instance

/* SQL Server: T-SQL Script To Generate Attach and Detach Commands for all User Databases On a SQL Instance */
-- Overview: SQL Scripts that generates commands for your attach and detach stored procedures for all of your user databases
-- Usage: Change the 'SET @DetachOrAttach' parameter to a '0' (attach) or '1' (detach) value to generate your T-SQL commands
-- Environments: SQL Server 2008 / 2012 /2014/2014

USE [master];
	GO
	DECLARE @database NVARCHAR(200) ,
	@cmd NVARCHAR(1000) ,
	@detach_cmd NVARCHAR(4000) ,
	@attach_cmd NVARCHAR(4000) ,
	@file NVARCHAR(1000) ,
	@i INT ,
	@DetachOrAttach BIT;
	SET @DetachOrAttach = 0; -- Change this to '0' for sp_attach_db commands; or '1' for sp_detach_db commands
	-- 0 Generates Attach Script
	-- 1 Generates Detach Script
	DECLARE dbname_cur CURSOR STATIC LOCAL FORWARD_ONLY
	FOR
	SELECT RTRIM(LTRIM([name]))
	FROM sys.databases
	WHERE database_id > 4;
	-- No system databases
	OPEN dbname_cur
	FETCH NEXT FROM dbname_cur INTO @database
	WHILE @@FETCH_STATUS = 0
	BEGIN
	SELECT @i = 1;
	SET @attach_cmd = '-- ' + QUOTENAME(@database) + CHAR(10)
	+ 'EXEC sp_attach_db @dbname = ''' + @database + '''' + CHAR(10);
	-- Change skip checks to false if you want to update statistics before you detach.
	SET @detach_cmd = '-- ' + QUOTENAME(@database) + CHAR(10)
	+ 'EXEC sp_detach_db @dbname = ''' + @database
	+ ''' , @skipchecks = ''true'';' + CHAR(10);
	-- Get a list of files for the database
	DECLARE dbfiles_cur CURSOR STATIC LOCAL FORWARD_ONLY
	FOR
	SELECT physical_name
	FROM sys.master_files
	WHERE database_id = DB_ID(@database)
	ORDER BY [file_id];
	OPEN dbfiles_cur
	FETCH NEXT FROM dbfiles_cur INTO @file
	WHILE @@FETCH_STATUS = 0
	BEGIN
	SET @attach_cmd = @attach_cmd + ' ,@filename'
	+ CAST(@i AS NVARCHAR(10)) + ' = ''' + @file + ''''
	+ CHAR(10);
	SET @i = @i + 1;
	FETCH NEXT FROM dbfiles_cur INTO @file
	END
	CLOSE dbfiles_cur;
	DEALLOCATE dbfiles_cur;
	IF ( @DetachOrAttach = 0 )
	BEGIN
	-- Output attach script
	PRINT @attach_cmd;
	END
	ELSE -- Output detach script
	PRINT @detach_cmd;
	FETCH NEXT FROM dbname_cur INTO @database
	END
	CLOSE dbname_cur;
	DEALLOCATE dbname_cur;