diff --git a/mirror-img.asd b/mirror-img.asd
index 5261ddd..3fe8ce2 100644
--- a/mirror-img.asd
+++ b/mirror-img.asd
@@ -1,6 +1,20 @@
-(defsystem "mirror-img"
+(require "asdf")
+
+(asdf:defsystem "mirror-img"
   :version "0.1"
   :license "GPLv3"
   :author "Jaidyn Ann <jadedctrl@posteo.at>"
   :depends-on (:dexador :lquery :split-sequence)
-  :components ((:file "src/mirror-img")))
+  :components ((:file "src/mirror-img"))
+  :in-order-to ((build-op (build-op "mirror-img/unix"))))
+
+(asdf:defsystem "mirror-img/unix"
+  :version "0.1"
+  :license "GPLv3"
+  :author "Jaidyn Ann <jadedctrl@posteo.at>"
+  :class asdf:program-system
+  :build-operation "program-op"
+  :build-pathname "mirror-img"
+  :entry-point "mirror-img/unix:main"
+  :depends-on (:mirror-img :unix-opts :cl-strings)
+  :components ((:file "src/unix")))
diff --git a/src/mirror-img.lisp b/src/mirror-img.lisp
index 751f5f3..dafc2f8 100644
--- a/src/mirror-img.lisp
+++ b/src/mirror-img.lisp
@@ -140,7 +140,7 @@ already set)."
   (handler-case
       (and (dexador:fetch (url-encode-uri (quri:uri url)) path)
            (pathname path))
-    (file-exists ()
+    (cl-user::file-exists ()
       path)
     (error nil)))
 
diff --git a/src/unix.lisp b/src/unix.lisp
new file mode 100644
index 0000000..cd9a4de
--- /dev/null
+++ b/src/unix.lisp
@@ -0,0 +1,72 @@
+;;;; mirror-img/unix: UNIX-style cli program frontend to mirror-img.
+
+;; Copyright © 2024 Jaidyn Ann <jadedctrl@posteo.at>
+;;
+;; This program is free software: you can redistribute it and/or
+;; modify it under the terms of the GNU General Public License as
+;; published by the Free Software Foundation, either version 3 of
+;; the License, or (at your option) any later version.
+;;
+;; This program is distributed in the hope that it will be useful,
+;; but WITHOUT ANY WARRANTY; without even the implied warranty of
+;; MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
+;; GNU General Public License for more details.
+;;
+;; You should have received a copy of the GNU General Public License
+;; along with this program. If not, see <https://www.gnu.org/licenses/>.
+
+(defpackage :mirror-img/unix
+  (:use :cl)
+  (:export :main))
+
+(in-package :mirror-img/unix)
+
+
+;;; Macros
+;;; ————————————————————————————————————————
+;; list symbol form
+(defmacro when-opt (opts option body)
+  `(when (getf ,opts ,option)
+     ,body))
+
+;; list symbol form form
+(defmacro if-opt (opts option if-form &optional else-form)
+  `(if (getf ,opts ,option)
+     ,if-form ,else-form))
+
+
+
+;;; Mirror-img (UNIX)
+;;; ————————————————————————————————————————
+;; NIL → NIL
+(defun main ()
+  "Actual invocation of the program. This is what you should set as :toplevel."
+  (multiple-value-bind (opts free) (opts:get-opts)
+    (when-opt opts :help (help))
+    (let* ((input-stream (pathname (car free))))
+      (when (not input-stream)
+        (format *error-output* "No file provided.~%")
+        (help 2))
+
+      (format
+       't
+       (mirror-img:mirror-img
+        input-stream
+        #p"mirror/")))))
+
+(opts:define-opts
+  (:name :help
+   :description "print this help text."
+   :short #\h  :long "help")
+  (:name :base
+   :description "directory for all mirrored files"
+   :short #\b :long "base"
+   :arg-parser (lambda (dir)
+                 (car (directory dir)))))
+
+;; number stream → nil
+(defun help (&optional (exit-code 0) (stream *standard-output*))
+  "Prints help message and dies."
+  (unix-opts:describe :prefix "usage: mirror-img [-h] [-b DIR] HTML_FILE"
+                      :stream stream)
+  (unix-opts:exit exit-code))