function cmd_help() {
    return "You need help? Sucks to be you! Hahahahaha";
}

function cmd_clear() {
    window.location.reload();
    return "";
}

function cmd_exec(input) {
    if (input === undefined)
        return "You must enter parameters!";
    const str = input.join(' ');
    if (/[',:;a-zA-Z]/.test(str) || str === "")
        return "Invalid input!";
    const chars = str.split('').filter(e => {
        const code = e.charCodeAt(0);
        const s = code ===  32;
        const a = code >    36;
        const b = code <    63;
        const c = code ===  94;
        const d = code === 124;
        return !(s || a && b || c || d);
    });
    if (chars.length > 0)
        return "Invalid input!";
    return (new Function(`return ${str}`))();
}