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

Posted on 2006-07-17
Last Modified: 2012-05-05
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.
Question by:AmolDesai23
Welcome to Experts Exchange

Add your voice to the tech community where 5M+ people just like you are talking about what matters.

  • Help others & share knowledge
  • Earn cash & points
  • Learn & ask questions
  • 3
  • 2
  • 2
  • +2
LVL 86

Expert Comment

ID: 17123109
What do you mean by 'locate'?
LVL 23

Expert Comment

ID: 17123129
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");

Author Comment

ID: 17123146
Thanks Ajay... let me try this out.
Salesforce Made Easy to Use

On-screen guidance at the moment of need enables you & your employees to focus on the core, you can now boost your adoption rates swiftly and simply with one easy tool.

LVL 12

Expert Comment

ID: 17123209
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).

Expert Comment

ID: 17124647
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;

Author Comment

ID: 17125748

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

thanks for your help.

Accepted Solution

owenli27 earned 125 total points
ID: 17126696
/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
LVL 23

Expert Comment

ID: 17127372
> 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.

Author Comment

ID: 17129585
Thanks Owenli and Ajay.

Featured Post

[Webinar] Code, Load, and Grow

Managing multiple websites, servers, applications, and security on a daily basis? Join us for a webinar on May 25th to learn how to simplify administration and management of virtual hosts for IT admins, create a secure environment, and deploy code more effectively and frequently.

Question has a verified solution.

If you are experiencing a similar issue, please ask a related question

Suggested Solutions

Title # Comments Views Activity
maven module vs maven project 3 116
Facing this issue for maven proxy setting 2 44
What browser will run Java? 7 177
Netbeans and org.apache.commons.lang3 issue 3 53
For beginner Java programmers or at least those new to the Eclipse IDE, the following tutorial will show some (four) ways in which you can import your Java projects to your Eclipse workbench. Introduction While learning Java can be done with…
In this post we will learn different types of Android Layout and some basics of an Android App.
Viewers learn about the “while” loop and how to utilize it correctly in Java. Additionally, viewers begin exploring how to include conditional statements within a while loop and avoid an endless loop. Define While Loop: Basic Example: Explanatio…
Viewers will learn about the different types of variables in Java and how to declare them. Decide the type of variable desired: Put the keyword corresponding to the type of variable in front of the variable name: Use the equal sign to assign a v…
Suggested Courses

734 members asked questions and received personalized solutions in the past 7 days.

Join the community of 500,000 technology professionals and ask your questions.

Join & Ask a Question