Help please! [using Runtime.exec() to run find command in UNIX]

Question

Hi guys! im trying to use exec() to run the UNIX find command
that my application uses. As you can see from my sample code, the find command finds all files ending with html in my home directory. Unfortunately when I run the program it doesn't give me an output, but when I run it on the shell in the same directory as this code is saved, it works perfectly fine.
Could someone please help me on this one. Many thanks! =)
import java.io.*;
import java.lang.String;
public class RunCommand {
        public static void main(String[] args) {
                try {
                        String[] command = {"find", "~/", "-name",
                                        "*.html", "-print"};
                        String find_str;
                        Process find_proc = Runtime.getRuntime().exec(
                                        command);
                        DataInputStream find_in = new DataInputStream(
                                        find_proc.getInputStream());
                        try {
                                while ((find_str = find_in.readLine())
                                                                != null) {
                                        System.out.println(find_str);
                        } catch (IOException e) {
                                System.exit(0);
                } catch (IOException e1) {
                        System.err.println(e1);
                        System.exit(1);
                System.exit(0);
}

Answer 1

I don't see anythi obvious. In both catch blocks, call printSckTrace on the exception yhou caught.
I think the real culprit is the ~ though.
~ is interpreted by some (most?) shells to men home dir. However, when you just exec a command, you don't have a shell to do that interpretation for you, so it's looking for a directory that's literally named ~.
Either exec a shell (read the man pages for the shell of your choice, but for zsh I think it's "/bin/zsh -c find ~ blah blah blah) or else just put the actual path to your home directory into the string you pass to exec. You can get that from System.getProperty("user.home").