Command Line - Batch File Guru

I know we have one around here... Can you explain when you need to use the tilda ~ like "~1%" vs "1%"?
I have a batch file that should be getting kicked off everytime a new file is discovered in a specifi folder (Directoy Monitor program). This was their code
Execute: C:\MyScripts\MyCopyBatch.bat
Parameters: %fullfile% %filename%
The code for MyCopyBatch.bat would look like this
copy /Y "~%1" "D:\Shared\tix\BGS\~%2"
But it looks like the ~ is appending to the filename and making it error file cannot be found.
I changed to
copy /Y "%1" "D:\Mason\Group\Shared\scale-tix\BGS\
No second parameter and it copies just fine.

 

I'm no guru but you changed the batch file more than just removing the second parameter.

It seems like the file path in the first batch file is wrong.

In a batch file the tilde expands the given variable.