I am using this function below to execute a script that I wrote in C++. However, it is not running and not providing an error message. The system executing part of the statement runs (because I could put "touch data1.dat" as the string and it works)... Why can I not run my C++ program with the syntax below? public static final void test1( String abc ) { try { System.out.println("Executing dir"); Process p = Runtime.getRuntime().exec("/mydir/myscript param1 param2 param3"); System.out.println(abc); } catch (Throwable t) { System.out.println("ERROR: " + t.getMessage()); } }

In its simplest form, exec() is quite easy to use: Process p = Runtime.getRuntime().exec("/bin/ls"); "The problem with this form is that it gets you nowhere. When Java forks a new process it redirects STDIN, STDOUT and STDERR. Therefore the results of "/bin/ls" do not go to the screen. Instead you must use the getInputStream(), getOutputStream() and getErrorStream() methods of the Process object to communicate with the program that you executed. " Below is an example using the Unix ls(1) command. import java.io.*; class execInput { public static void main(String Argv[]) { try { String ls_str; Process ls_proc = Runtime.getRuntime().exec("/bin/ls -aFl"); // get its output (your input) stream DataInputStream ls_in = new DataInputStream( ls_proc.getInputStream()); try { while ((ls_str = ls_in.readLine()) != null) { System.out.println(ls_str); } } catch (IOException e) { System.exit(0); } } catch (IOException e1) { System.err.println(e1); System.exit(1); } System.exit(0); } }