fix: Update usage messages in command classes for consistency

Author: nihaltp

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

@@ -26,7 +26,7 @@ public void execute(String[] args, ShellContext context) throws IOException {
             String name = parts[0].trim();
             String cmd = parts[1].trim();
             if (name.isEmpty() || cmd.isEmpty()) {
-                System.out.println("Invalid alias format. Usage: alias name=command");
+                System.out.println("Invalid alias format. Usage: \n" + usage());
                 return;
             }
             context.addAlias(name, cmd);
@@ -44,7 +44,8 @@ public void execute(String[] args, ShellContext context) throws IOException {
             }
             String cmd = sb.toString();
             if (name.trim().isEmpty() || cmd.trim().isEmpty()) {
-                System.out.println("Invalid alias. Usage: alias name command... or alias name=command");
+                System.out.println(
+                        "Invalid alias. Usage: \n" + usage());
                 return;
             }
             context.addAlias(name, cmd);

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

@@ -26,7 +26,7 @@ public void execute(String[] args, ShellContext context) {
             String color = args[0];
 
             if (color.length() != 2) {
-                System.out.println("Usage: color <background><text>");
+                System.out.println("Usage: " + usage());
                 return;
             }
 

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

@@ -22,7 +22,7 @@ public class CopyCommand implements Command {
     @Override
     public void execute(String[] args, ShellContext context) {
         if (args.length < 2) {
-            System.out.println("Usage: copy <source> <destination>");
+            System.out.println("Usage: " + usage());
             return;
         }
         File src = new File(context.getCurrentDir(), args[0]);

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

@@ -21,7 +21,7 @@ public class DelCommand implements Command {
     @Override
     public void execute(String[] args, ShellContext context) {
         if (args.length == 0) {
-            System.out.println("Usage: del <file_name>");
+            System.out.println("Usage: " + usage());
             return;
         }
         for (String name : args) {

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

@@ -20,7 +20,7 @@ public class MkdirCommand implements Command {
     @Override
     public void execute(String[] args, ShellContext context) {
         if (args.length == 0) {
-            System.out.println("Usage: mkdir <directory_name>");
+            System.out.println("Usage: " + usage());
             return;
         }
         File dir = new File(context.getCurrentDir(), args[0]);

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

@@ -23,7 +23,7 @@ public class MoveCommand implements Command {
     @Override
     public void execute(String[] args, ShellContext context) throws IOException {
         if (args.length < 2) {
-            System.out.println("Usage: move <source> <destination>");
+            System.out.println("Usage: " + usage());
             return;
         }
 

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

@@ -23,7 +23,7 @@ public class RmdirCommand implements Command {
     @Override
     public void execute(String[] args, ShellContext context) {
         if (args.length == 0) {
-            System.out.println("Usage: rmdir <directory_name>");
+            System.out.println("Usage: " + usage());
             return;
         }
         File dir = new File(context.getCurrentDir(), args[0]);

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

@@ -19,7 +19,7 @@ public class TelnetCommand implements Command {
     @Override
     public void execute(String[] args, ShellContext context) throws IOException {
         if (args.length < 1) {
-            System.out.println("Usage: telnet <host> [port]");
+            System.out.println("Usage: " + usage());
             return;
         }
 

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

@@ -23,7 +23,7 @@ public void execute(String[] args, ShellContext context) {
             String title = String.join(" ", args);
             System.out.println("\033]0;" + title + "\007");
         } else {
-            System.out.println("Usage: title <new title>");
+            System.out.println("Usage: " + usage());
         }
     }
 

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

@@ -22,8 +22,8 @@
 public class TouchCommand implements Command {
     @Override
     public void execute(String[] args, ShellContext context) throws IOException {
-        if (args.length < 1) {  // ✅ Check for at least 1 argument
-            System.out.println("Usage: touch <filename>");
+        if (args.length < 1) { // ✅ Check for at least 1 argument
+            System.out.println("Usage: " + usage());
             return;
         }