execute a shell script from java.md

/**
* execute shell script
*/
private static void executeScript() {
	try {
	    String bash = "/bin/bash";
	    String script = "script.sh";
	    String[] command = { bash, script };
	
	    System.out.println("Starting execute the script");
	    ProcessBuilder processBuilder = new ProcessBuilder(command);
	    
	    Map<String, String> env = processBuilder.environment();
	    env.put("ENV_KEY", "ENV_VALUE");
	    Process process = processBuilder.start();
	
	    // output the process
	    BufferedReader br = new BufferedReader(new InputStreamReader(process.getInputStream()));
	    String line = null;
	    while ((line = br.readLine()) != null) {
	        System.out.println(line);
	    }
	    // wait for the end of process
	    process.waitFor();
	    System.out.println("Script executed successfully");
	} catch (Exception e) {
	    throw new RuntimeException("Can not execute the install script successfully");
	}
}

ProcessBuilder is used to create operating system processes. Each ProcessBuilder instance manages a collection of process attributes. The start() method creates a new Process instance with those attributes. The start() method can be invoked repeatedly from the same instance to create new subprocesses with identical or related attributes.