Fixed bugs with refactored Company/job code. Added 'expr' Terminal command

src/Terminal.js

@@ -1090,6 +1090,24 @@ let Terminal = {
                     }
                 }
                 post("Error: " + fn + " does not exist");
+                break;
+            case "expr":
+                if (commandArray.length <= 1) {
+                    post("Incorrect usage of expr command. Usage: expr [math expression]");
+                    return;
+                }
+                const expr = commandArray.slice(1).join("");
+
+                // Sanitize the math expression
+                const sanitizedExpr = expr.replace(/s+/g, '').replace(/[^-()\d/*+.]/g, '');
+                let result;
+                try {
+                    result = eval(sanitizedExpr);
+                } catch(e) {
+                    post(`Could not evaluate expression: ${sanitizedExpr}`);
+                    return;
+                }
+                post(result);
                 break;
 			case "free":
 				Terminal.executeFreeCommand(commandArray);