Running a shell script using ProcessBuilder

Question

I am trying to run a script using Java and ProcessBuilder. When I try to run, I receive the following message: error=2, No such file or directory.

I dont know what I am doing wrong but here is my code (ps: I tried to execute just the script without arguments and the error is the same:

String[] command = {"/teste/teste_back/script.sh, "+argument1+", "+argument+""};
ProcessBuilder p = new ProcessBuilder(command);

    try {  

        // create a process builder to send a command and a argument
        Process p2 = p.start(); 
        BufferedReader br = new BufferedReader(new InputStreamReader(p2.getInputStream()));
        String line;

        log.info("Output of running " + command + " is: ");
        System.out.println("Output of running " + command + " is: ");
        while ((line = br.readLine()) != null) {
            log.info(line);
        }

    }

Possible duplicate of Difference between ProcessBuilder and Runtime.exec() — Steephen
– Steephen, Commented Aug 8, 2017 at 14:23

Jagan N · Accepted Answer · 2017-08-08 14:21:11Z

6

Try replacing

String[] command = {"/teste/teste_back/script.sh, "+argument1+", "+argument+""};

with

String[] command = {"/teste/teste_back/script.sh", argument1, argument};

Refer ProcessBuilder for more information.

ProcessBuilder(String... command)

Constructs a process builder with the specified operating system program and arguments.

answered Aug 8, 2017 at 14:21

Jagan N

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2 Comments

Alvp Over a year ago

Actually the problem were the quotation on the final of my string and also with arguments.

flowers1234 Over a year ago

@JaganathanNanthakumar Hi , in my shellscript there is user and pw as arguments. But how do I initialize them? when I put them into the String command the program does not know what "user" and "pw" is...? Thank you

binbjz · Accepted Answer · 2017-11-29 05:29:23Z

You can define a method with ProcessBuilder.

public static Map execCommand(String... str) {
    Map<Integer, String> map = new HashMap<>();
    ProcessBuilder pb = new ProcessBuilder(str);
    pb.redirectErrorStream(true);
    Process process = null;
    try {
        process = pb.start();
    } catch (IOException e) {
        e.printStackTrace();
    }

    BufferedReader reader = null;
    if (process != null) {
        reader = new BufferedReader(new InputStreamReader(process.getInputStream()));
    }

    String line;
    StringBuilder stringBuilder = new StringBuilder();
    try {
        if (reader != null) {
            while ((line = reader.readLine()) != null) {
                stringBuilder.append(line).append("\n");
            }
        }
    } catch (IOException e) {
        e.printStackTrace();
    }

    try {
        if (process != null) {
            process.waitFor();
        }
    } catch (InterruptedException e) {
        e.printStackTrace();
    }

    if (process != null) {
        map.put(0, String.valueOf(process.exitValue()));
    }

    try {
        map.put(1, stringBuilder.toString());
    } catch (StringIndexOutOfBoundsException e) {
        if (stringBuilder.toString().length() == 0) {
            return map;
        }
    }
    return map;
}

You can call the function to execute shell command or script

String cmds = "ifconfig";
String[] callCmd = {"/bin/bash", "-c", cmds};
System.out.println("exit code:\n" + execCommand(callCmd).get(0).toString());
System.out.println();
System.out.println("command result:\n" + execCommand(callCmd).get(1).toString());

Adder · Accepted Answer · 2017-08-08 14:21:38Z

3

Unless your script.sh has a comma in its name, that is the mistake:

String[] command = {"/teste/teste_back/script.sh" , argument1, argument};

answered Aug 8, 2017 at 14:21

Adder

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