runtime.exec

Possible Duplicate: How do I set environment variables from Java? I'm trying to set an environment variable, and read it back to verify it was actually set. I've got the following : import java.io.IOException; public class EnvironmentVariable { public static void main(String[] args) throws IOException { Runtime.getRuntime().exec("cmd.exe set FOO=false"); String s = System.getenv("FOO"); System.out.println(s); } } However, it appears that FOO is always null, meaning its probably not set correctly. Do I have the exec command correct? The javadocs state it can take a string argument as the

I use Runtime exec() method to create a subprocess in Java. However, since the subprocess is an interactive program, I need to provide input to it as and when required by it. Also I need to show the output of the subprocess. How can I do this in the simplest possible way? I was using a StreamGobbler to show the program output using process.getInputStream(). I, however, do not know how to identify when the program is waiting for input and when to provide it input using proc.getOutputStream. How can I do this? vitaut You need to copy the input and output between the subprocess' streams and

This might already been answered before but that was regarding unicode and I don't think this is unicode (it's in ASCII so...). When I execute this in my terminal there is no problem what so ever vboxmanage setextradata "Test Machine" "VBoxInternal/Devices/pcnet/0/LUN#0/Config/ssh/HostPort" 2222 However when I use the following in Java Runtime.getRuntime().exec("vboxmanage setextradata \"Test Machine\" \"VBoxInternal/Devices/pcnet/0/LUN#0/Config/ssh/HostPort\" 2222"); It returns an error: unregistered vm '"TestMachine"' The same goes for parameters with spaces in them like Test\ Machine, then

I am executing a command which returns me the Revision number of a file; 'fileName'. But if there is some problem executing the command, then the application hangs up. What can I do to avoid that condition? Please find below my code. String cmd= "cmd /C si viewhistory --fields=revision --project="+fileName; Process p = Runtime.getRuntime().exec(cmd) ; BufferedReader in = new BufferedReader(new InputStreamReader(p.getInputStream())); String line = null; while ((line = in.readLine()) != null) { System.out.println(line); } } catch (Exception e) { e.printStackTrace(); } I guess the issue is that

I have the following class. It allows me to execute commands through java. public class ExecuteShellCommand { public String executeCommand(String command) { StringBuffer output = new StringBuffer(); Process p; try { p = Runtime.getRuntime().exec(command); p.waitFor(); BufferedReader reader = new BufferedReader(new InputStreamReader(p.getInputStream())); String line = ""; while ((line = reader.readLine())!= null) { output.append(line + "\n"); } } catch (Exception e) { e.printStackTrace(); } return output.toString(); } } When I run commands, the result of the previous command isn't saved. For

I am trying to start the CMD application in windows by using the following code, but it doesn't work as expected. Several examples from different websites shows that "cmd" as an argument in the ProcessBuilder construct should work. What do I have to do to make my Java app open the CMD application in windows? public class JavaTest { public static void main(String[] args) { ProcessBuilder pb = new ProcessBuilder("cmd"); try { pb.start(); System.out.println("cmd started"); } catch (IOException e) { System.out.println(e.getMessage()); } } } When I try to use a non-existing application it actually

I have an application, running on the Playframework, which needs to encode some video files. I used Process pr = Runtime.getRuntime().exec(execCode) for this (and it works perfectly), but as I need both, the output stream and the error stream, I am trying to use ProcessBuilder (as is also recommended). But I cannot get it to work (testing on a MacBook). Is there a fundamental difference between the Runtime method and the ProcessBuilder? This is my code for ProcessBuilder (exactly the same code works when replaced by Runtime.getRuntime().exec() ) String execCode = "/opt/local/bin/ffmpeg -i file