How to separate file name and extension into variables on the commandline

I need to copy a file x.dtsx from location a to location b.

If x.dtsx already exists in b then I need to rename x.dtsx to x_Standby.dtsx Then, after renaming copy x.dtsx to b

My current code looks like this:

if exists %1 rename %1 %(should be 1_standy.extension)
xcopy %1 %2

If you use the Command Processor Extensions (which is default on Windows 2000 and later) then you can use the following optional syntax:

%~1 - expands %1 removing any surrounding quotes (")
%~f1 - expands %1 to a fully qualified path name
%~d1 - expands %1 to a drive letter only
%~p1 - expands %1 to a path only
%~n1 - expands %1 to a file name only
%~x1 - expands %1 to a file extension only
%~s1 - expanded path contains short names only
%~a1 - expands %1 to file attributes
%~t1 - expands %1 to date/time of file
%~z1 - expands %1 to size of file

The modifiers can be combined to get compound results:

%~dp1 - expands %1 to a drive letter and path only
%~nx1 - expands %1 to a file name and extension only

So your command would look something like this:

if exist %2\%~nx1 ren %2\%~nx1 %~n1_standby%~x1