*Nix ls Command in Java

Question

Anyone aware of a method/class/library that will allow me to easily reproduce the results of the *nix ls -l command in Java? Calling ls directly is not an option due to platform independence.

eg. $ls -l myprogram.exe

-rwxrwxrwx 1 auser None 1261568 Nov 15 17:41 C:\myprogram.exe

To clarify, can you say exactly what part(s) of the 'ls -l' output you need? For example, if you just needed the file size and modification date, then a plain old java.io.File object should do the trick. But if you want the permission information too, you're getting into platform-specific territory there and will require more sophisticated classes. — Jeff
– Jeff, Commented Jan 5, 2010 at 15:50
Excellent point. I'm porting an existing ksh script, so I was hoping to find a method out in the Ether to drop in and use. Absent that I will probably just take what's available in java.io.File. — javacavaj
– javacavaj, Commented Jan 5, 2010 at 16:09

Asaph · Accepted Answer · 2010-01-05 15:44:10Z

3

Here is a tutorial on getting a directory listing in java with sample source code.

answered Jan 5, 2010 at 15:44

Asaph

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1 Comment

bkoch Over a year ago

Here is the Javadoc for the File class that is covered the tutorial that Asaph mentions. java.sun.com/javase/6/docs/api

trashgod · Accepted Answer · 2010-01-05 21:53:47Z

2

Here's an implementation of ls -R ~, which lists files recursively starting in the home directory:

import java.io.*;

public class ListDir {

    public static void main(String args[]) {
        File root;
        if (args.length > 0) root = new File(args[0]);
        else root = new File(System.getProperty("user.dir"));
        ls(root); 
    }

    /** iterate recursively */
    private static void ls(File f) { 
        File[] list = f.listFiles();
        for (File file : list) {
            if (file.isDirectory()) ls(file);
            else System.out.println(file);
        }
    }
}

answered Jan 5, 2010 at 21:53

trashgod

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Comments

ennuikiller · Accepted Answer · 2010-01-05 15:43:15Z

1

This provides what you are looking for:

answered Jan 5, 2010 at 15:43

ennuikiller

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beggs · Accepted Answer · 2010-01-05 15:46:40Z

0

You can use the java.nio.file package.

answered Jan 5, 2010 at 15:46

beggs

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Upul Bandara · Accepted Answer · 2010-01-05 15:46:20Z

-1

I think we don't have ready to use Java class in java stadard library. But you can develop a tool like *nix ls -l tool by using classes in java.io package.

answered Jan 5, 2010 at 15:46

Upul Bandara

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