diff --git a/src/Readline.php b/src/Readline.php
index 56327a2..165233b 100644
--- a/src/Readline.php
+++ b/src/Readline.php
@@ -491,27 +491,6 @@ public function getDrawString()
         return $output;
     }
 
-    /**
-     * Clears the current input prompt (if any)
-     *
-     * Usually, there should be no need to call this method manually. It will
-     * be invoked automatically whenever we detect that output needs to be
-     * written in place of the current prompt. The prompt will be rewritten
-     * after clearing the prompt and writing the output.
-     *
-     * @return self
-     * @see Stdio::write() which is responsible for invoking this method
-     * @internal
-     */
-    public function clear()
-    {
-        if ($this->prompt !== '' || ($this->echo !== false && $this->linebuffer !== '')) {
-            $this->output->write("\r\033[K");
-        }
-
-        return $this;
-    }
-
     /** @internal */
     public function onKeyBackspace()
     {
diff --git a/src/Stdio.php b/src/Stdio.php
index 77035d5..0329741 100644
--- a/src/Stdio.php
+++ b/src/Stdio.php
@@ -179,8 +179,7 @@ public function end($data = null)
         $this->ending = true;
 
         // clear readline output, close input and end output
-        $this->readline->setInput('')->setPrompt('')->clear();
-        $this->restoreTtyMode();
+        $this->readline->setInput('')->setPrompt('');
         $this->input->close();
         $this->output->end();
     }
@@ -195,8 +194,7 @@ public function close()
         $this->closed = true;
 
         // clear readline output and then close
-        $this->readline->setInput('')->setPrompt('')->clear()->close();
-        $this->restoreTtyMode();
+        $this->readline->setInput('')->setPrompt('');
         $this->input->close();
         $this->output->close();
     }
@@ -227,6 +225,8 @@ public function handleEnd()
     /** @internal */
     public function handleCloseInput()
     {
+        $this->restoreTtyMode();
+
         if (!$this->output->isWritable()) {
             $this->close();
         }
@@ -249,9 +249,9 @@ private function restoreTtyMode()
             // remove dummy readline handler to turn to default input mode
             $this->usesExtReadlineHandler = false;
             readline_callback_handler_remove();
-        } elseif ($this->originalTtyMode !== null && $this->isTty()) {
+        } elseif ($this->originalTtyMode !== null && is_resource(STDIN) && $this->isTty()) {
             // Reset stty so it behaves normally again
-            shell_exec(sprintf('stty %s', $this->originalTtyMode));
+            shell_exec('stty ' . escapeshellarg($this->originalTtyMode));
             $this->originalTtyMode = null;
         }
 
@@ -344,15 +344,10 @@ private function isTty()
         // For what it's worth, checking for device gid 5 (tty) is less reliable.
         // @link http://man7.org/linux/man-pages/man7/inode.7.html
         // @link https://www.kernel.org/doc/html/v4.11/admin-guide/devices.html#terminal-devices
-        if (is_resource(STDIN)) {
-            $stat = fstat(STDIN);
-            $mode = isset($stat['mode']) ? ($stat['mode'] & 0170000) : 0;
-            $major = isset($stat['dev']) ? (($stat['dev'] >> 8) & 0xff) : 0;
+        $stat = fstat(STDIN);
+        $mode = isset($stat['mode']) ? ($stat['mode'] & 0170000) : 0;
+        $major = isset($stat['dev']) ? (($stat['dev'] >> 8) & 0xff) : 0;
 
-            if ($mode === 0020000 && $major >= 2 && $major <= 143 && ($major <=5 || $major >= 128)) {
-                return true;
-            }
-        }
-        return false;
+        return ($mode === 0020000 && $major >= 2 && $major <= 143 && ($major <=5 || $major >= 128));
     }
 }