how to invoke a linux command inside a java code ?

kusum · 11-22-2003, 12:42 AM

I want to execute my some linux commands like mkdir ,or any linux command, through my java code.
How do I do his ,can anybody tell me ?
if any one knows this ,can u plz send me an example of this.
pleazzzzzzzzzzzzzzzz..........
thanx.

Hangdog42 · 11-22-2003, 07:51 AM

Um, why would you want to run an external command? That pretty much defeats the purpose of using Java in the first place. Besides, most commands, like mkdir, have Java equivalents. In fact, the Java equivalent of mkdir is, well, mkdir and it is in the java.io class. Using the real Java methods to do those tasks means that your code is actually portable.

german · 11-23-2003, 01:19 PM

Everything Hangdog said is true (except that mkDir() is a method of the java.io.File class), this totally wrecks the platform neutrality of your application, but here is how to invoke native commands from within java:

Code:

public class Test {
  private static String[] command = new String[] {
    "mkdir",
    "bunk"
  };

  public static void main(String[] args) {
    try {
      Runtime rt = Runtime.getRuntime();
      Process p = rt.exec(command);
      // this is optional if you're holding for the native cmd to finish
      int n = p.waitFor(); // returns exit status of native code
      System.exit(n);
    } catch(Exception e) {
      e.printStackTrace();
    }
  }
}

HTH

B.