diff --git a/cp-unseen b/cp-unseen
new file mode 100755
index 0000000..06210dc
--- /dev/null
+++ b/cp-unseen
@@ -0,0 +1,66 @@
+#!/usr/bin/env python3
+# Copy unseen files
+
+import sys
+if sys.version_info < (3, 3):
+    sys.stderr.write("Sorry, requires at least Python 3.3\n")
+    sys.exit(1)
+
+import argparse
+import collections
+import os
+import pickle
+import shlex
+import shutil
+
+
+def read_seen():
+    global seen
+    try:
+        with open(os.path.expanduser('~/.local/share/cp-unseen/seen.pickle'), 'rb') as f:
+            seen = pickle.load(f)
+    except FileNotFoundError:
+        seen = set()
+
+
+def save_seen():
+    global seen
+    if not os.path.exists(os.path.expanduser('~/.local/share/cp-unseen')):
+        os.mkdir(os.path.expanduser('~/.local/share/cp-unseen'))
+    with open(os.path.expanduser('~/.local/share/cp-unseen/seen.pickle'), 'wb') as f:
+        pickle.dump(seen, f)
+
+
+def main():
+    global seen, drive
+
+    parser = argparse.ArgumentParser(
+        description='Copy unseen files')
+    parser.add_argument('folder', type=str, help='folder to copy from')
+    # XXX folder to copy *to*!
+    args = parser.parse_args()
+
+    read_seen()
+
+    file_list = [os.path.join(dp, f) \
+            for dp, _, filenames in os.walk(args.folder) \
+            for f in filenames]
+
+    for file1 in file_list:
+        if file1 in seen:
+            continue
+
+        local_filename = os.path.basename(file1)
+        if not os.path.exists(local_filename):
+            print(file1)
+            shutil.copy(file1, local_filename)
+            seen.add(file1)
+            save_seen()
+        else:
+            print("{} exists locally!".format(shlex.quote(local_filename)))
+            sys.exit(2)
+
+
+main()
+
+# vim:tw=100: