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+#!/usr/bin/env python
+"""
+Concatenate pages from pdf files into a single pdf file.
+
+Page ranges refer to the previously-named file.
+A file not followed by a page range means all the pages of the file.
+
+PAGE RANGES are like Python slices.
+        {page_range_help}
+EXAMPLES
+    pdfcat -o output.pdf head.pdf content.pdf :6 7: tail.pdf -1
+        Concatenate all of head.pdf, all but page seven of content.pdf,
+        and the last page of tail.pdf, producing output.pdf.
+
+    pdfcat chapter*.pdf >book.pdf
+        You can specify the output file by redirection.
+
+    pdfcat chapter?.pdf chapter10.pdf >book.pdf
+        In case you don't want chapter 10 before chapter 2.
+"""
+# Copyright (c) 2014, Steve Witham <switham_github@mac-guyver.com>.
+# All rights reserved. This software is available under a BSD license;
+# see https://github.com/mstamy2/PyPDF2/LICENSE
+
+from __future__ import print_function
+import argparse
+from PdfFileTransformer.PyPDF2.pagerange import PAGE_RANGE_HELP
+
+
+def parse_args():
+    parser = argparse.ArgumentParser(
+        description=__doc__.format(page_range_help=PAGE_RANGE_HELP),
+        formatter_class=argparse.RawDescriptionHelpFormatter)
+    parser.add_argument("-o", "--output",
+                        metavar="output_file")
+    parser.add_argument("-v", "--verbose", action="store_true",
+                        help="show page ranges as they are being read")
+    parser.add_argument("first_filename", nargs=1,
+                        metavar="filename [page range...]")
+    # argparse chokes on page ranges like "-2:" unless caught like this:
+    parser.add_argument("fn_pgrgs", nargs=argparse.REMAINDER,
+                        metavar="filenames and/or page ranges")
+    args = parser.parse_args()
+    args.fn_pgrgs.insert(0, args.first_filename[0])
+    return args
+
+
+from sys import stderr, stdout, exit
+import os
+import traceback
+from collections import defaultdict
+
+from PdfFileTransformer.PyPDF2 import PdfFileMerger, parse_filename_page_ranges
+
+
+if __name__ == "__main__":
+    args = parse_args()
+    filename_page_ranges = parse_filename_page_ranges(args.fn_pgrgs)
+    if args.output:
+        output = open(args.output, "wb")
+    else:
+        stdout.flush()
+        output = os.fdopen(stdout.fileno(), "wb")
+
+    merger = PdfFileMerger()
+    in_fs = dict()
+    try:
+        for (filename, page_range) in filename_page_ranges:
+            if args.verbose:
+                print(filename, page_range, file=stderr)
+            if filename not in in_fs:
+                in_fs[filename] = open(filename, "rb")
+            merger.append(in_fs[filename], pages=page_range)
+    except:
+        print(traceback.format_exc(), file=stderr)
+        print("Error while reading " + filename, file=stderr)
+        exit(1)
+    merger.write(output)
+    # In 3.0, input files must stay open until output is written.
+    # Not closing the in_fs because this script exits now.