I want to communicate with the linux terminal with java code. I want to store the output and work with it. I implemented the code below following the instructions in given link.
I would expect the complete terminal output of help. But neither for the standard commands, nor for the mosquitto commands I get anything from the input stream. Where is the mistake? Or are you supposed to do it completely differnt?
Stackoverflow link: how to run a command at terminal from java program?
import java.io.BufferedReader; import java.io.IOException; import java.io.InputStream; import java.io.InputStreamReader; public class LinuxInputStream { public static void main(String[] args) { // Linux Terminal String prefix = "/bin/bash"; String terminalCommand = "help"; String mosquittoCommand = "mosquitto --help"; ProcessBuilder pb1 = new ProcessBuilder( new String[] {prefix, terminalCommand}); ProcessBuilder pb2 = new ProcessBuilder( new String[] {prefix, mosquittoCommand}); try { executeCommand(pb1); } catch (IOException e) { System.out.println("IO Error in Terminal Command execution!"); e.printStackTrace(); } try { executeCommand(pb2); } catch (IOException e) { System.out.println("IO Error in Mosquitto Command execution!"); e.printStackTrace(); } } private static void executeCommand(ProcessBuilder pb) throws IOException { Process terminalCommandProcess = pb.start(); InputStream inputStream = terminalCommandProcess.getInputStream(); BufferedReader br = new BufferedReader( new InputStreamReader(inputStream)); String line; int i = 0; while ((line = br.readLine()) != null) { System.out.println("Line: " + line); i++; } if (i == 0) System.out.println("Nothing read from input stream"); } } Output:
Nothing read from input stream
Nothing read from input stream
