The standard output of Runtime.exec is not automatically sent to the standard output of the caller. Something like this aught to do – get access to the standard output of the forked process, read it and then write it out. Note that the output from the forked process is availble to the parent using the … Read more
The problem is, the redirection character (>) is a shell-based construct, not an executable. So unless you’re running this command through something like bash (which you’re not), it’s going to be interpreted as a literal character argument to your exiftool invocation. If you want to get this to work, you have two options: Get bash … Read more
Runtime.getRuntime().exec(“netsh”); See Runtime Javadoc. EDIT: A later answer by leet suggests that this process is now deprecated. However, as per the comment by DJViking, this appears not to be the case: Java 8 documentation. The method is not deprecated.
It is a bit strange but you can run the second program without forking it. Just calling the main method in it. So forget the runtime section and do this: sam2.main(new String[0]); Of course this way you must compile sam2 at compile time
There is no executable called cd, because it can’t be implemented in a separate process. The problem is that each process has its own current working directory and implementing cd as a separate process would only ever change that processes current working directory. In a Java program you can’t change your current working directory and … Read more
This is the solution but you have to set: echo 1 > /proc/sys/vm/overcommit_memory
I recently ran into this problem and just wanted to mention that since java 7 the process builder api has been expanded. This problem can now be solved with: ProcessBuilder pb = new ProcessBuilder(“yourcommand”); pb.redirectOutput(Redirect.INHERIT); pb.redirectError(Redirect.INHERIT); Process p = pb.start();
I have modified the code to include some checks: public class Laj { private static void printLines(String name, InputStream ins) throws Exception { String line = null; BufferedReader in = new BufferedReader( new InputStreamReader(ins)); while ((line = in.readLine()) != null) { System.out.println(name + ” ” + line); } } private static void runProcess(String command) throws … Read more
Use getErrorStream(). BufferedReader in = new BufferedReader(new InputStreamReader(pr.getErrorStream())); EDIT: You can use ProcessBuilder (and also read the documentation) ProcessBuilder ps=new ProcessBuilder(“java.exe”,”-version”); //From the DOC: Initially, this property is false, meaning that the //standard output and error output of a subprocess are sent to two //separate streams ps.redirectErrorStream(true); Process pr = ps.start(); BufferedReader in = new … Read more
Why do some commands fail? This happens because the command passed to Runtime.exec(String) is not executed in a shell. The shell performs a lot of common support services for programs, and when the shell is not around to do them, the command will fail. When do commands fail? A command will fail whenever it depends … Read more