Appends a copy of file to other file.
fileconcat <file1> <file2>
Appends a copy of file <file2> to the end of file <file1>.
<file1> and <file2> must not be same.
If <file2> is added successfully, the system variable "result" is set to 0. Otherwise, "result" is set to non-zero.
fileconcat 'test.dat' test2.dat'