run linux command from java

Question

i tried to run linux command from jar file, but i always get this error:

java.io.IOException: Cannot run program "ls": error=13, Permission denied.

here is my code:

String s;
    Process p;
    String cmd= "ls";

    try {
        Runtime run = Runtime.getRuntime();
        p = run.exec(cmd);
        BufferedReader br = new BufferedReader(new InputStreamReader(p.getInputStream()));

        while ((s = br.readLine()) != null){
        System.out.println("line: " + s);
        }

        p.waitFor();
        System.out.println ("exit: " + p.exitValue());
        p.destroy();

    } catch (Exception e) {
        System.out.println(e);
    }

thanks for your time.

UPDATE: For me, my solution is: i had to reinstall my OS and JDK, everything is working now.

Sounds like you have a file called ls that's not an executable program. Try changing the command to "/bin/ls" — Joni
– Joni, Commented Mar 26, 2020 at 2:00
same error: java.io.IOException: Cannot run program "/bin/ls": error=13, Permission denied — Jake
– Jake, Commented Mar 26, 2020 at 2:04
java.io.IOException: Cannot run program "ls": error=13, Permission denied — Jake
– Jake, Commented Mar 26, 2020 at 2:08
Run the terminal from the folder where jar is present. To give all the permissions (read, write & execute) -> chmod -R 777 /folder. Then execute the jar — Anish B.
– Anish B., Commented Mar 26, 2020 at 2:10

Arvind Kumar Avinash · Accepted Answer · 2020-03-27 21:30:10Z

I hope you are familiar with vi. If not, ignore the 3rd command given below and just copy Main.java file to /Users/your-user-directory/

cd ~
pwd
vi Main.java
javac Main.java
java Main

Main.java

import java.io.BufferedReader;
import java.io.InputStreamReader;

public class Main {
    public static void main(String[] args) {
        String s;
        Process p;
        String cmd = "ls";

        try {
            Runtime run = Runtime.getRuntime();
            p = run.exec(cmd);
            BufferedReader br = new BufferedReader(new InputStreamReader(p.getInputStream()));

            while ((s = br.readLine()) != null) {
                System.out.println("line: " + s);
            }

            p.waitFor();
            System.out.println("exit: " + p.exitValue());
            p.destroy();

        } catch (Exception e) {
            System.out.println(e);
        }
    }
}

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