exec
public Process exec(String command)
             throws IOExceptionExecutes the specified string command in a separate process.  
The command argument is parsed into tokens and then executed as a command in a separate process. The token parsing is done by a StringTokenizer created by the call:  
 
 new StringTokenizer(command)
 with no further modifications of the character categories. This method has exactly the same effect as exec(command, null).
Parameters:
command - a specified system command.
Returns:
a Process object for managing the subprocess.
Throws:
SecurityException - if a security manager exists and its checkExec method doesn't allow creation of a subprocess.
IOException - if an I/O error occurs