How to create a folder with a MS-DOS command

To create a folder/directory using a DOS command, do the following :

Open up a command window i.e. Winkey + R and type cmd into the field and press Enter.
Type : md c:\Testfolder and press Enter

That's it, you will now have a folder called 'Testfolder' on your C drive !

How to merge multiple .csv files into one .txt file using command line

Create a folder on your c: drive called 'All csv files' and place all of your .csv files inside.
Open notepad and add the text below
cd C:\All csv files

copy *.csv Merged.txt

Save the text file and changed its extension to .bat 'merge.bat'.
Double click the file and you will see that a txt file is created in the C:\All csv files folder called 'Merged.txt' with all your consolidated information inside !.