aa.bat:
 @echo off
 rem ** 引数をファイルだとみなして修飾操作する **
 echo --------------------------------------------
 echo arg1=%1
 echo arg1=%~1
 echo arg1=%~f1
 echo arg1=%~d1
 echo arg1=%~p1
 echo arg1=%~n1
 echo arg1=%~x1
 echo arg1=%~s1
 echo arg1=%~a1
 echo arg1=%~t1
 echo arg1=%~z1
 echo --------------------------------------------