The Runtime run.=the Runtime getRuntime (); 
String CMD="md5sum - b * * *"; 
Process Process=run. The exec (CMD); 

An error

 
Java. IO. IOException: always run the program "md5sum" : the error=2, No to the file or directory 

But it is no problem in the terminal operation,
The problem is likely to be there?

And I change the md5sum to diff found to execute the command,