Merge pull request #16 from nihaltp/feat/hostname

Add HostnameCommand to  display hostname

Author: anshumanjadiya1102

src/main/java/com/mycmd/App.java

@@ -51,6 +51,7 @@ private static void registerCommands(Map<String, Command> commands) {
         commands.put("help", new HelpCommand(commands));
         commands.put("exit", new ExitCommand());
         commands.put("ver", new VersionCommand());
+        commands.put("hostname", new HostnameCommand());
         commands.put("whoami", new WhoamiCommand());
         commands.put("touch", new TouchCommand());
         commands.put("time", new TimeCommand());

src/main/java/com/mycmd/commands/HostnameCommand.java

@@ -0,0 +1,21 @@
+package com.mycmd.commands;
+
+import java.net.InetAddress;
+
+import com.mycmd.Command;
+import com.mycmd.ShellContext;
+
+public class HostnameCommand implements Command {
+    @Override
+    public void execute(String[] args, ShellContext context) {
+        String hostname = System.getenv("COMPUTERNAME");
+        if (hostname == null) {
+            try {
+                hostname = InetAddress.getLocalHost().getHostName();
+            } catch (Exception e) {
+                hostname = "Unknown Host";
+            }
+        }
+        System.out.println(hostname);
+    }
+}