diff --git a/src/zutil/net/InetScanner.java b/src/zutil/net/InetScanner.java
new file mode 100644
index 0000000..fd7bd2f
--- /dev/null
+++ b/src/zutil/net/InetScanner.java
@@ -0,0 +1,80 @@
+package zutil.net;
+
+import zutil.osal.MultiCommandExecutor;
+import zutil.osal.OSAbstractionLayer;
+
+import java.io.*;
+
+/**
+ * Created by Ziver on 2016-09-11.
+ */
+public class InetScanner {
+    private static final int TIMEOUT_MS = 50;
+
+
+    public static void main(String[] args){
+        //scan();
+        scan2();
+    }
+
+
+    public static void scan(){
+        for (int i = 1; i < 255; i++) {
+            String ip = "192.168.1."+i;
+            System.out.println(ip+": "+isReachableByPing(ip));
+        }
+    }
+    public static boolean isReachableByPing(String host) {
+        try{
+            String[] output = OSAbstractionLayer.exec(getPlatformPingCmd(host));
+            if (output[2].contains("TTL=") || output[2].contains("ttl="))
+                return true;
+
+        } catch( Exception e ) {
+            e.printStackTrace();
+        }
+        return false;
+    }
+
+
+    public static void scan2(){
+        try{
+            MultiCommandExecutor exec = new MultiCommandExecutor();
+            // execute the desired command (here: ls) n times
+            for (int i = 1; i < 255; i++) {
+                try {
+                    String ip = "192.168.1."+i;
+                    exec.exec(getPlatformPingCmd(ip));
+
+                    System.out.print(ip+": ");
+                    boolean online = false;
+                    for (String line; (line=exec.readLine()) != null;) {
+                        if (line.contains("TTL=") || line.contains("ttl="))
+                            online = true;
+                    }
+                    System.out.println(online);
+                }
+                catch (IOException e) {
+                    System.out.println(e);
+                }
+            }
+
+            exec.close();
+        }
+        catch (Exception e) {
+            e.printStackTrace();
+        }
+    }
+
+    private static String getPlatformPingCmd(String ip){
+        switch (OSAbstractionLayer.getInstance().getOSType()){
+            case Windows:
+                return "ping -n 1 -w "+ TIMEOUT_MS +" " + ip;
+            case Linux:
+            case MacOS:
+                return "ping -c 1 -W "+ TIMEOUT_MS +" " + ip;
+            default:
+                return null;
+        }
+    }
+}
diff --git a/src/zutil/osal/MultiCommandExecutor.java b/src/zutil/osal/MultiCommandExecutor.java
new file mode 100644
index 0000000..5ba7bc2
--- /dev/null
+++ b/src/zutil/osal/MultiCommandExecutor.java
@@ -0,0 +1,105 @@
+package zutil.osal;
+
+import zutil.parser.Base64Encoder;
+
+import java.io.*;
+import java.security.SecureRandom;
+import java.security.Security;
+
+/**
+ * This class starts a platform specific shell and runs all commands
+ * in a single process thereby lowering the execution time.
+ *
+ * <br><br>
+ */
+public class MultiCommandExecutor implements AutoCloseable{
+    private static final String SHELL_WINDOWS = "cmd.exe";
+    private static final String SHELL_LINUX   = "/bin/bash";
+
+    private String delimiter;
+    private Process process;
+    private BufferedWriter stdin;
+    private BufferedReader stdout;
+    private boolean eol = true;
+
+
+    public MultiCommandExecutor(){
+        try {
+            // Generate delimiter
+            byte[] tmp = new byte[16];
+            SecureRandom.getInstance("SHA1PRNG").nextBytes(tmp);
+            delimiter = Base64Encoder.encode(tmp);
+
+            //init shell
+            String shellCmd;
+            switch (OSAbstractionLayer.getInstance().getOSType()){
+                case Windows:
+                    shellCmd = SHELL_WINDOWS; break;
+                case Linux:
+                case MacOS:
+                    shellCmd = SHELL_LINUX; break;
+                default:
+                    throw new RuntimeException("Unsupported OS");
+            }
+            process = new ProcessBuilder(shellCmd).start();
+
+            //get stdin of shell
+            stdin = new BufferedWriter(new OutputStreamWriter(process.getOutputStream()));
+            stdout = new BufferedReader(new InputStreamReader(process.getInputStream()));
+
+        } catch (RuntimeException e){
+            throw e;
+        } catch (Exception e){
+            throw new RuntimeException("Unable to initiate shell",e);
+        }
+    }
+
+
+    public void exec(String cmd) throws IOException {
+        while (readLine() != null); // read the output from previous exec
+        eol = false;
+
+        stdin.write(cmd);
+        switch (OSAbstractionLayer.getInstance().getOSType()){
+            case Windows:
+                stdin.write(" & echo & echo " + delimiter); break;
+            case Linux:
+            case MacOS:
+                stdin.write(" ; echo ; echo " + delimiter); break;
+        }
+        stdin.newLine();
+        stdin.flush();
+    }
+
+
+    /**
+     * @return one line from command execution, or null if the command has finished running
+     */
+    public String readLine() throws IOException {
+        if (eol)
+            return null;
+        String line = stdout.readLine();
+        if (line != null && line.startsWith(delimiter)) {
+            eol = true;
+            return null;
+        }
+        return line;
+    }
+
+
+    @Override
+    public void close(){
+        try {
+            // finally close the shell by execution exit command
+            stdin.write("exit");
+            stdin.newLine();
+            stdin.flush();
+            process.destroy();
+            process = null;
+            stdin = null;
+            stdout = null;
+        } catch (Exception e){
+            e.printStackTrace();
+        }
+    }
+}
diff --git a/src/zutil/osal/OSAbstractionLayer.java b/src/zutil/osal/OSAbstractionLayer.java
index 41d5e7d..eaed722 100644
--- a/src/zutil/osal/OSAbstractionLayer.java
+++ b/src/zutil/osal/OSAbstractionLayer.java
@@ -34,8 +34,8 @@ import java.util.ArrayList;
  * User: Ziver
  */
 public abstract class OSAbstractionLayer {
-    public static enum OSType{
-        Windows, Linux, MacOS, Unix
+    public enum OSType{
+        Windows, Linux, MacOS, Unix, Unknown
     }
 
     // Variables
@@ -51,7 +51,8 @@ public abstract class OSAbstractionLayer {
         String os = System.getProperty("os.name");
         if     (os.contains("Linux"))   return new OsalLinuxImpl();
         else if(os.contains("Windows")) return new OsalWindowsImpl();
-        else                            return null;
+        else if(os.contains("Mac"))     return new OsalMacOSImpl();
+        else                            return new OsalDummyImpl();
     }
 
     /**
@@ -60,8 +61,8 @@ public abstract class OSAbstractionLayer {
      * @param   cmd             the command to run
      * @return first line of the command
      */
-    protected static String getFirstLineFromCommand(String cmd) {
-        String[] tmp = runCommand(cmd);
+    protected static String getFirstLineFromExec(String cmd) {
+        String[] tmp = exec(cmd);
         if(tmp.length > 1)
             return tmp[0];
         return null;
@@ -73,23 +74,19 @@ public abstract class OSAbstractionLayer {
      * @param   cmd             the command to run
      * @return a String list of the output of the command
      */
-    public static String[] runCommand(String cmd) {
+    public static String[] exec(String cmd) {
         ArrayList<String> ret = new ArrayList<String>();
         try {
-            Runtime runtime = Runtime.getRuntime();
-            Process proc = runtime.exec(cmd);
+            Process proc = Runtime.getRuntime().exec(cmd);
             proc.waitFor();
             BufferedReader output = new BufferedReader(new InputStreamReader(proc.getInputStream()));
 
-
             String line;
             while ((line = output.readLine()) != null) {
                 ret.add(line);
             }
             output.close();
-        } catch (InterruptedException e) {
-            e.printStackTrace();
-        } catch (IOException e) {
+        } catch (Exception e) {
             e.printStackTrace();
         }
 
@@ -101,11 +98,6 @@ public abstract class OSAbstractionLayer {
      */
     public abstract OSType getOSType();
 
-    /**
-     * @return a more specific OS or distribution name e.g "ubuntu", "suse", "windows"
-     */
-    public abstract String getOSName();
-
     /**
      * @return the OS version e.g windows: "vista", "7"; ubuntu: "10.4", "12.10"
      */
diff --git a/src/zutil/osal/OsalDummyImpl.java b/src/zutil/osal/OsalDummyImpl.java
new file mode 100644
index 0000000..d489fa6
--- /dev/null
+++ b/src/zutil/osal/OsalDummyImpl.java
@@ -0,0 +1,68 @@
+/*
+ * The MIT License (MIT)
+ *
+ * Copyright (c) 2015 Ziver Koc
+ *
+ * Permission is hereby granted, free of charge, to any person obtaining a copy
+ * of this software and associated documentation files (the "Software"), to deal
+ * in the Software without restriction, including without limitation the rights
+ * to use, copy, modify, merge, publish, distribute, sublicense, and/or sell
+ * copies of the Software, and to permit persons to whom the Software is
+ * furnished to do so, subject to the following conditions:
+ *
+ * The above copyright notice and this permission notice shall be included in
+ * all copies or substantial portions of the Software.
+ *
+ * THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS OR
+ * IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF MERCHANTABILITY,
+ * FITNESS FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT. IN NO EVENT SHALL THE
+ * AUTHORS OR COPYRIGHT HOLDERS BE LIABLE FOR ANY CLAIM, DAMAGES OR OTHER
+ * LIABILITY, WHETHER IN AN ACTION OF CONTRACT, TORT OR OTHERWISE, ARISING FROM,
+ * OUT OF OR IN CONNECTION WITH THE SOFTWARE OR THE USE OR OTHER DEALINGS IN
+ * THE SOFTWARE.
+ */
+
+package zutil.osal;
+
+import java.io.File;
+
+/**
+ * This is a dummy implementation for unknown platforms
+ */
+public class OsalDummyImpl extends OSAbstractionLayer {
+
+    @Override
+    public OSType getOSType() {
+        return OSType.Unknown;
+    }
+
+    @Override
+    public String getOSVersion() {
+        throw new UnsupportedOperationException();
+    }
+
+    @Override
+    public String getKernelVersion() {
+        throw new UnsupportedOperationException();
+    }
+
+    @Override
+    public String getUsername() {
+        throw new UnsupportedOperationException();
+    }
+
+    @Override
+    public File getUserConfigPath() {
+        throw new UnsupportedOperationException();
+    }
+
+    @Override
+    public File getGlobalConfigPath() {
+        throw new UnsupportedOperationException();
+    }
+
+    @Override
+    public HardwareAbstractionLayer getHAL() {
+        throw new UnsupportedOperationException();
+    }
+}
diff --git a/src/zutil/osal/OsalLinuxImpl.java b/src/zutil/osal/OsalLinuxImpl.java
index 327d4be..ac45a95 100644
--- a/src/zutil/osal/OsalLinuxImpl.java
+++ b/src/zutil/osal/OsalLinuxImpl.java
@@ -27,7 +27,7 @@ package zutil.osal;
 import java.io.File;
 
 /**
- * User: Ziver
+ * Linux platform specific implementation
  */
 public class OsalLinuxImpl extends OSAbstractionLayer {
     private static HalLinuxImpl hal;
@@ -37,20 +37,16 @@ public class OsalLinuxImpl extends OSAbstractionLayer {
         return OSType.Linux;
     }
 
-    @Override
-    public String getOSName() {
-        return null;  //To change body of implemented methods use File | Settings | File Templates.
-    }
 
     @Override
     public String getOSVersion() {
-        return null;  //To change body of implemented methods use File | Settings | File Templates.
+        throw new UnsupportedOperationException();
     }
 
     @Override
     public String getKernelVersion() {
         try{
-            return super.getFirstLineFromCommand("uname -r");
+            return super.getFirstLineFromExec("uname -r");
         } catch(Exception e){
             e.printStackTrace();
         }
@@ -60,7 +56,7 @@ public class OsalLinuxImpl extends OSAbstractionLayer {
     @Override
     public String getUsername() {
         try{
-            return super.getFirstLineFromCommand("whoami");
+            return super.getFirstLineFromExec("whoami");
         } catch(Exception e){
             e.printStackTrace();
         }
diff --git a/src/zutil/osal/OsalMacOSImpl.java b/src/zutil/osal/OsalMacOSImpl.java
new file mode 100644
index 0000000..3e88371
--- /dev/null
+++ b/src/zutil/osal/OsalMacOSImpl.java
@@ -0,0 +1,71 @@
+/*
+ * The MIT License (MIT)
+ *
+ * Copyright (c) 2015 Ziver Koc
+ *
+ * Permission is hereby granted, free of charge, to any person obtaining a copy
+ * of this software and associated documentation files (the "Software"), to deal
+ * in the Software without restriction, including without limitation the rights
+ * to use, copy, modify, merge, publish, distribute, sublicense, and/or sell
+ * copies of the Software, and to permit persons to whom the Software is
+ * furnished to do so, subject to the following conditions:
+ *
+ * The above copyright notice and this permission notice shall be included in
+ * all copies or substantial portions of the Software.
+ *
+ * THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS OR
+ * IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF MERCHANTABILITY,
+ * FITNESS FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT. IN NO EVENT SHALL THE
+ * AUTHORS OR COPYRIGHT HOLDERS BE LIABLE FOR ANY CLAIM, DAMAGES OR OTHER
+ * LIABILITY, WHETHER IN AN ACTION OF CONTRACT, TORT OR OTHERWISE, ARISING FROM,
+ * OUT OF OR IN CONNECTION WITH THE SOFTWARE OR THE USE OR OTHER DEALINGS IN
+ * THE SOFTWARE.
+ */
+
+package zutil.osal;
+
+import com.mysql.jdbc.NotImplemented;
+
+import java.io.File;
+
+/**
+ * MacOS platform specific implementation
+ */
+public class OsalMacOSImpl extends OSAbstractionLayer {
+
+    @Override
+    public OSType getOSType() {
+        return OSType.MacOS;
+    }
+
+
+    @Override
+    public String getOSVersion() {
+        throw new UnsupportedOperationException();
+    }
+
+    @Override
+    public String getKernelVersion() {
+        throw new UnsupportedOperationException();
+    }
+
+    @Override
+    public String getUsername() {
+        throw new UnsupportedOperationException();
+    }
+
+    @Override
+    public File getUserConfigPath() {
+        return new File("/home/"+getUsername());
+    }
+
+    @Override
+    public File getGlobalConfigPath() {
+        throw new UnsupportedOperationException();
+    }
+
+    @Override
+    public HardwareAbstractionLayer getHAL() {
+        throw new UnsupportedOperationException();
+    }
+}
diff --git a/src/zutil/osal/OsalWindowsImpl.java b/src/zutil/osal/OsalWindowsImpl.java
index 8f64ae7..a4e8de0 100644
--- a/src/zutil/osal/OsalWindowsImpl.java
+++ b/src/zutil/osal/OsalWindowsImpl.java
@@ -27,28 +27,24 @@ package zutil.osal;
 import java.io.File;
 
 /**
- * User: ezivkoc
+ * Windows platform specific implementation
  */
 public class OsalWindowsImpl extends OSAbstractionLayer {
-    @Override
-    public OSType getOSType() {
-        return null;
-    }
 
     @Override
-    public String getOSName() {
-        return null;
+    public OSType getOSType() {
+        return OSType.Windows;
     }
 
     @Override
     public String getOSVersion() {
-        return null;
+        throw new UnsupportedOperationException();
     }
 
     @Override
     public String getKernelVersion() {
         try {
-            return getFirstLineFromCommand("ver");
+            return getFirstLineFromExec("ver");
         } catch (Exception e) {
             e.printStackTrace();
         }
@@ -57,21 +53,21 @@ public class OsalWindowsImpl extends OSAbstractionLayer {
 
     @Override
     public String getUsername() {
-        return null;
+        throw new UnsupportedOperationException();
     }
 
     @Override
     public File getUserConfigPath() {
-        return null;
+        throw new UnsupportedOperationException();
     }
 
     @Override
     public File getGlobalConfigPath() {
-        return null;
+        throw new UnsupportedOperationException();
     }
 
     @Override
     public HardwareAbstractionLayer getHAL() {
-        return null;
+        throw new UnsupportedOperationException();
     }
 }
diff --git a/src/zutil/osal/app/linux/AptGet.java b/src/zutil/osal/app/linux/AptGet.java
index 2413a6d..e3580eb 100644
--- a/src/zutil/osal/app/linux/AptGet.java
+++ b/src/zutil/osal/app/linux/AptGet.java
@@ -43,13 +43,13 @@ public class AptGet {
 
     public static void install(String pkg) {
         update();
-        OSAbstractionLayer.runCommand("apt-get -y install " + pkg);
+        OSAbstractionLayer.exec("apt-get -y install " + pkg);
         packageTimer.reset();
     }
 
     public static void upgrade(){
         update();
-        OSAbstractionLayer.runCommand("apt-get -y " +
+        OSAbstractionLayer.exec("apt-get -y " +
                 // Dont display configuration conflicts
                 "-o Dpkg::Options::=\"--force-confdef\" -o Dpkg::Options::=\"--force-confold\" " +
                 "upgrade");
@@ -59,13 +59,13 @@ public class AptGet {
     public static void update(){
         // Only run every 5 min
         if(updateTimer.hasTimedOut()){
-            OSAbstractionLayer.runCommand("apt-get update");
+            OSAbstractionLayer.exec("apt-get update");
             updateTimer.start();
         }
     }
 
     public static void purge(String pkg) {
-        OSAbstractionLayer.runCommand("apt-get --purge remove " + pkg);
+        OSAbstractionLayer.exec("apt-get --purge remove " + pkg);
         packageTimer.reset();
     }
 
@@ -77,7 +77,7 @@ public class AptGet {
     public static synchronized void updatePackages(){
         // Only run every 5 min
         if(packageTimer.hasTimedOut()){
-            String[] output = OSAbstractionLayer.runCommand("dpkg --list");
+            String[] output = OSAbstractionLayer.exec("dpkg --list");
             for(int i=5; i<output.length; ++i) {
                 packages.put(output[i], new Package(output[5]));
             }
diff --git a/src/zutil/osal/app/linux/Ps.java b/src/zutil/osal/app/linux/Ps.java
index 45c7cf9..ec1862b 100644
--- a/src/zutil/osal/app/linux/Ps.java
+++ b/src/zutil/osal/app/linux/Ps.java
@@ -33,7 +33,7 @@ public class Ps {
     private static OSAbstractionLayer os = OSAbstractionLayer.getInstance();
 
     public static boolean isRunning(int pid){
-        String[] output = os.runCommand("ps -p "+pid);
+        String[] output = os.exec("ps -p "+pid);
         return output.length > 1;
     }
 }
diff --git a/src/zutil/osal/app/windows/TypePerf.java b/src/zutil/osal/app/windows/TypePerf.java
index cdb79f8..619a268 100755
--- a/src/zutil/osal/app/windows/TypePerf.java
+++ b/src/zutil/osal/app/windows/TypePerf.java
@@ -67,7 +67,7 @@ public class TypePerf {
     private static DataNode[] execute(String path) throws IOException {
         DataNode[] ret = new DataNode[2];
 
-        String[] output = OSAbstractionLayer.runCommand("typeperf \""+ path +"\"  -SC 0 -y");
+        String[] output = OSAbstractionLayer.exec("typeperf \""+ path +"\"  -SC 0 -y");
         CSVParser parser = new CSVParser(new StringReader(output[1] + "\n" + output[2]));
 
         ret[0] = parser.getHeaders();