= {XAPpend|APPend} source target [/r] [/:]

       /b   TSO file tarnsfer without conversion.

       - Same as COPy with /+ specified, /s option is invalid.
       - When source is directory and target is not exist,Traget file
         is created then appended all files in source directory.
         Sub-directory is ignored.
         If target is directory,append is executed to files in
         the target directory.