Sample code to access a file on Unix from a Java program on windows

Hello Experts,

This i guess a pretty simple question for you all.
Can anybody provide me sample java code to locate a folder (say, "test") and locate a  ".txt" file in it on Unix and display its path? Java program will be written in Windows and then ported on to Unix box.

Thanks for your help.
Who is Participating?

Improve company productivity with a Business Account.Sign Up

Weiping DuConnect With a Mentor Senior Web DeveloperCommented:
/usr/bin/find --  find is a binary utility and usually located /bin,  /usr/bin or /usr/sbin folder. It is used to search the entire filesystem for one or more files that you specify to look for. This is very helpful when a file has been "lost".

/export -- is an examle I gave you, it means I want to do a search only inside /export or its sub directory.  if you use "/" it means search a file from root of filesystem, will search every folder or sub folder. It cost your time and performance.
-type d -- search a directory name only(-type f means search for a file only)

-name testDir -- a filename or folder name you want to search
What do you mean by 'locate'?
This should work:

        File file = new File("test");
        String[] list = file.list(new FilenameFilter() {

            public boolean accept(File dir, String name) {
                return name.toLowerCase().endsWith(".txt");
Free Tool: IP Lookup

Get more info about an IP address or domain name, such as organization, abuse contacts and geolocation.

One of a set of tools we are providing to everyone as a way of saying thank you for being a part of the community.

AmolDesai23Author Commented:
Thanks Ajay... let me try this out.
Shortly ... you cannot do that.

If no bridge between Windows and Unix File System is installed, you have no way of doing that, because Windows FS is not compatible with Unix FS. You would need some bridging functionality installed on either the Unix machine (Samba for example) or on Windows (for example some SFTP implementation).
Weiping DuSenior Web DeveloperCommented:
AmolDesai, this sample java code should work for you....

public static void main (String args[])  {

        String s1 = "/usr/bin/find /export -type d -name testDir\r\n";
        String result = findResult(s1);

        if(result != null && result.length() != 0)
                String s2 = "/usr/bin/find " + result + "/ -type f -name fileName.txt\r\n";
                result = findResult(s2);

                if(result != null && result.length() != 0)

        public static String findResult(String str)
          String line = null;
                Runtime runTime = Runtime.getRuntime();
                Process process = runTime.exec(str);

                InputStream inputStream = process.getInputStream();
                InputStreamReader  inputStreamReader = new InputStreamReader (inputStream);
                BufferedReader bufferedReader = new BufferedReader(inputStreamReader);

               while ( (line = bufferedReader.readLine()) != null ){
                    if( !line.endsWith("Permission denied") )

             }catch (Throwable t) {

            return line;
AmolDesai23Author Commented:

Can you plz explain me this command: "/usr/bin/find /export -type d -name testDir?

thanks for your help.
> Shortly ... you cannot do that.
You can - instead of running find command (or any other os dependent command), you can use list() function on the file. But you can write a recursive function to walk through the directory tree.
AmolDesai23Author Commented:
Thanks Owenli and Ajay.
Question has a verified solution.

Are you are experiencing a similar issue? Get a personalized answer when you ask a related question.

Have a better answer? Share it in a comment.

All Courses

From novice to tech pro — start learning today.