Question

So I am trying to write an .sh file that will be executable, this is how I’m currently writing it:

Writer output = null;  try {   output = new BufferedWriter(new FileWriter(file2));   output.write(shellScriptContent);   output.close(); } catch (IOException ex) {   Logger.getLogger(PunchGUI.class.getName()).log(Level.SEVERE, null, ex); } 

So that writes the file just fine, but it is not executable. Is there a way to change the executable status when I write it?

Edit: To further clarify, I am trying to make it execute by default, so that for instance, if you double clicked the generated file, it would automatically execute.

Answer 1

You’d need to chmod it, and you can probably do it by exec’ing a system command like such:

Really all you’d need is to fire off something like this:

Runtime.getRuntime().exec('chmod u+x '+FILENAME); 

But if you want to keep track of it more explicitly can capture stdin / stderr then something more like:

Process p = Runtime.getRuntime().exec('chmod u+x '+FILENAME); BufferedReader stdInput = new BufferedReader(new InputStreamReader(p.getInputStream()));     BufferedReader stdError = new BufferedReader(new InputStreamReader(p.getErrorStream())); 

Which I got from here: http://www.devdaily.com/java/edu/pj/pj010016/pj010016.shtml

Update:

Test program:

package junk; import java.io.BufferedWriter; import java.io.FileWriter; import java.io.IOException; import java.io.Writer;  public class Main{   private String scriptContent = '#!/bin/bash \n echo 'yeah toast!' > /tmp/toast.txt';   public void doIt(){     try{       Writer output = new BufferedWriter(new FileWriter('/tmp/toast.sh'));       output.write(scriptContent);       output.close();       Runtime.getRuntime().exec('chmod u+x /tmp/toast.sh');     }catch (IOException ex){}   }    public static void main(String[] args){     Main m = new Main();     m.doIt();   }  } 

On linux if you open up a file browser and double click on /tmp/toast.sh and choose to run it, it should generate a text file /tmp/toast.txt with the words ‘yeah toast’. I assume Mac would do the same since it’s BSD under the hood.