optimization and echo command

js/commands.js

@@ -56,3 +56,7 @@ function cmd_exec(input) {
     // Execute input and return output
     return (new Function(`return ${str}`))().toString();
 }
+
+function cmd_echo(input) {
+    return input.join(' ');
+}

js/main.js

@@ -162,7 +162,12 @@ function createText(str, safe=true) {
 
 // Run input as command if possible
 function runCommand(input) {
+    // Return on no input
+    if (input === "")
+        return "";
+
     let output = "";
+    const lowerIn = input.toLowerCase();
 
     // Go through properties of window
     for (const func in window) {
@@ -170,12 +175,13 @@ function runCommand(input) {
         // If property is prefixed with 'cmd_' (a 'command', so an executable function)
         if (splits.length === 2) {
             const name = splits[1];
+            const lowerNm = name.toLowerCase();
             // If command is called without parameters
-            if (input.toLowerCase() === name.toLowerCase()) {
+            if (lowerIn === lowerNm) {
                 output = window[func]();
                 break;
             // If command is called with parameters
-            } else if (input.startsWith(name + " ")) {
+            } else if (lowerIn.startsWith(lowerNm + " ")) {
                 // Parameters always follow the command name after first space
                 const params = input.split(" ").filter((e,i)=>i!==0);
                 output = window[func](params);
@@ -184,6 +190,10 @@ function runCommand(input) {
         }
     }
 
+    // Standard output:
+    if (output === "")
+        output = `${input.split(" ")[0]}: command not found`;
+
     // Return command output
     return output;
 }