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Message: [QUOTE="Robert Klemme, post: 643869"] InputStream.read(new byte[0],0,0) should return -1 on EOF - but it may block. IMHO it's too complicated to create an algorithm that makes assumptions when the stream might be at EOF. In this case a solution is to check process status by invoking exitStatus() and catching the exception like public static boolean running(Process p) { try { p.exitStatus(); return false; } catch ( IllegalStateException e ) { return true; } } [URL]http://java.sun.com/j2se/1.4.2/docs/api/java/lang/Process.html#exitValue()[/URL] Thread overhead isn't really that high so IMHO it's best to just use threads. At least this is what I'd trie *before* I start optimizing threads away. Kind regards robert [/QUOTE]