List of available users

Hi All,
I need to have a list of all available users in an OS using java. Can anyone suggest how to achieve this.
Thanks in advance.
bubul

But how to get the list of the users in linuxHave your program read and parse /etc/passwd
(see http://linux.ctyme.com/man/man2325.htm)
You say "it is required to set access configurations for each individual
user available in an OS". It is far from clear why you would need
a list of all the users to do this. For example, why not let the user
set the configuration, and store this in the user's home directory?
If it is a security matter that the users themselves cannot set, the
network administrator should provide the configuration information
in a way your program can access (a file at a specific location, or by
using existing mechanisms like group membership). In this case your
program need only know about the identity of the current user.

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But some elements of the list are not available !
Other problem :
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SecretKey key = SecretKeyFactory.getInstance(algo).generateSecret(keySpec);here is the whole code for you to understand better :
    /* CLASSE                  : CryptoUtils                                 */
    /* PACKAGE                 : crypto.utils                                */
    /* AUTEUR                  : Guillaume YVON                              */
    /* CREATION                : 15-07-2005                                  */
    /* DERNIERE MODIFICATION   : 17-07-2005                                  */
    /* DESCRIPTION             : gestion du cryptage / d�cryptage            */
package crypto.utils;
import crypto.component.*;
import java.io.*;
import java.util.*;
import java.security.*;
import javax.crypto.*;
import javax.crypto.spec.*;
import java.security.spec.*;
public class CryptoUtils {
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    public static final int DECRYPT_MODE = 2;
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    /* Buffer utilis� pour transporter les octets entre les flux */
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    /*            PROCEDURE D'INITIALISATION DES CLES DE CRYPTAGE             */
    /* PARAMETRES D'ENTREE                                                    */
    /*      - password => mot de passe pour le cryptage : String              */
    /* PARAMETRES DE SORTIE                                                   */
    /*      - aucun                                                           */
    private static void init(String password,String algo) {
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            AlgorithmParameterSpec paramSpec = new PBEParameterSpec(salt, iterationCount);
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            ecipher.init(Cipher.ENCRYPT_MODE, key, paramSpec);
            dcipher.init(Cipher.DECRYPT_MODE, key, paramSpec);
        } catch (Exception e){ System.err.println(e); }
    /*                   PROCEDURE DE CRYPTAGE / DECRYPTAGE                   */
    /* PARAMETRES D'ENTREE                                                    */
    /*      - mode        => mode de cryptage/decryptage : int                */
    /*      - in          => flux d'entr�e (lecture) : InputStream            */
    /*      - out         => flux de sortie (�criture) : OutputStream         */
    /*      - srcSize     => taille du fichier source : long                  */
    /*      - progressBar => barre de progression                             */
    /* PARAMETRES DE SORTIE                                                   */
    /*      - aucun                                                           */
    private static void crypt(int mode, InputStream in, OutputStream out, long srcSize,
JProgressBarWindow progressBar){
        try {
            if(mode == ENCRYPT_MODE){
                /* Les octets �crits dans out seront crypt�s */
                out = new CipherOutputStream(out, ecipher);
            }else if(mode == DECRYPT_MODE){
                /* Les octets lus dans in seront d�crypt�s */
                in = new CipherInputStream(in, dcipher);
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            int sum = 0;
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                out.write(buf, 0, numRead);
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                Float percent = sum / (new Float(srcSize)) * 100;
                if(progressBar!=null) progressBar.setValue(percent.intValue());
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        } catch (java.io.IOException e) { System.out.println(e); }
    /*             PROCEDURE DE LANCEMENT DU CRYPTAGE/DECRYPTAGE              */
    /* PARAMETRES D'ENTREE                                                    */
    /*      - mode        => mode de cryptage/decryptage : int                */
    /*      - algo        => algorythme � utiliser : String                   */
    /*      - srcFile     => flux d'entr�e (lecture) : String                 */
    /*      - tgtFile     => flux de sortie (�criture) : String               */
    /*      - password    => taille du fichier source : String                */
    /*      - progressBar => barre de progression : JProgressBarWindow        */
    /*      - text        => texte � afficher : String                        */
    /* PARAMETRES DE SORTIE                                                   */
    /*      - aucun                                                           */
    public static void launch(int mode,String algo,String srcFile,String tgtFile,String password,
                                JProgressBarWindow progressBar,String text){
        try {
            init(password,algo);
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            crypt(mode,new FileInputStream(srcFile),new
FileOutputStream(tgtFile),FileUtils.getFileSize(srcFile), progressBar);
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    /*      FONCTION QUI RENVOIE LES IMPLEMENTATIONS DISPONIBLES POUR         */
    /*                          UN TYPE DE SERVICE                            */
    /* PARAMETRES D'ENTREE                                                    */
    /*      - serviceType => nom du service                                   */
    /* PARAMETRES DE SORTIE                                                   */
    /*      - liste des impl�mentations : String[]                            */
    public static String[] getCryptoImpls(String serviceType) {
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        Provider[] providers = Security.getProviders();
        for (int i=0; i<providers.length; i++) {
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                String key = (String)it.next();
                key = key.split(" ")[0];
                if (key.startsWith(serviceType+".")) {
                    result.add(key.substring(serviceType.length()+1));
                } else if (key.startsWith("Alg.Alias."+serviceType+".")) {
                    result.add(key.substring(serviceType.length()+11));
        return (String[])result.toArray(new String[result.size()]);
    /*     FONCTION QUI RENVOIE LA LISTE DES TYPES DE SERVICE DISPONIBLES     */
    /* PARAMETRES D'ENTREE                                                    */
    /*      - aucun                                                           */
    /* PARAMETRES DE SORTIE                                                   */
    /*      - liste des services : String[]                                   */
    public static String[] getServiceTypes() {
        Set result = new HashSet();
        Provider[] providers = Security.getProviders();
        for (int i=0; i<providers.length; i++) {
            Set keys = providers[ i].keySet();
            for (Iterator it=keys.iterator(); it.hasNext(); ) {
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                key = key.split(" ")[0];
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                    key = key.substring(10);
                int ix = key.indexOf('.');
                result.add(key.substring(0, ix));
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}Any tip is welcome !
(sorry for the french comments...)

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