diff --git a/src/calibre/utils/complete.py b/src/calibre/utils/complete.py
new file mode 100644
index 0000000000..11ee0dcb0e
--- /dev/null
+++ b/src/calibre/utils/complete.py
@@ -0,0 +1,129 @@
+#!/usr/bin/env python
+# vim:fileencoding=UTF-8:ts=4:sw=4:sta:et:sts=4:ai
+from __future__ import with_statement
+
+__license__   = 'GPL v3'
+__copyright__ = '2009, Kovid Goyal <kovid@kovidgoyal.net>'
+__docformat__ = 'restructuredtext en'
+
+
+'''
+BASH completion for calibre commands that are too complex for simple
+completion.
+'''
+
+import sys, os, shlex, glob
+from functools import partial
+
+from calibre import prints
+
+debug = partial(prints, file=sys.stderr)
+
+def split(src):
+    try:
+        return shlex.split(src)
+    except ValueError:
+        try:
+            return shlex.split(src+'"')
+        except ValueError:
+            return shlex.split(src+"'")
+
+
+def files_and_dirs(prefix, allowed_exts=[]):
+    for i in glob.iglob(prefix+'*'):
+        _, ext = os.path.splitext(i)
+        ext = ext.lower().replace('.', '')
+        if os.path.isdir(i):
+            yield i+os.sep
+        elif allowed_exts is None or ext in allowed_exts:
+            yield i+' '
+
+def get_opts_from_parser(parser, prefix):
+    def do_opt(opt):
+        for x in opt._long_opts:
+            if x.startswith(prefix):
+                yield x
+        for x in opt._short_opts:
+            if x.startswith(prefix):
+                yield x
+    for o in parser.option_list:
+        for x in do_opt(o): yield x
+    for g in parser.option_groups:
+        for o in g.option_list:
+            for x in do_opt(o): yield x
+
+def send(ans):
+    for x in sorted(set(ans)):
+        x = x.replace(' ', '\\ ')
+        if x.endswith('\\ '):
+            x = x[:-2]+' '
+        prints(x)
+
+
+
+class EbookConvert(object):
+
+    def __init__(self, comp_line, pos):
+        words = split(comp_line[:pos])
+        char_before = comp_line[pos-1]
+        prefix = words[-1] if words[-1].endswith(char_before) else ''
+        wc = len(words)
+        if not prefix:
+            wc += 1
+        self.words = words
+        self.prefix = prefix
+        self.previous = words[-2 if prefix else -1]
+        self.complete(wc)
+
+    def complete(self, wc):
+        if wc == 2:
+            self.complete_input()
+        elif wc == 3:
+            self.complete_output()
+        else:
+            from calibre.ebooks.conversion.cli import create_option_parser
+            from calibre.utils.logging import Log
+            log = Log()
+            log.outputs = []
+            ans = []
+            if not self.prefix or self.prefix.startswith('-'):
+                try:
+                    parser, _ = create_option_parser(self.words[:3], log)
+                    ans += list(get_opts_from_parser(parser, self.prefix))
+                except:
+                    pass
+            if self.previous.startswith('-'):
+                ans += list(files_and_dirs(self.prefix, None))
+            send(ans)
+
+    def complete_input(self):
+        from calibre.ebooks.conversion.plumber import supported_input_formats
+        ans = list(files_and_dirs(self.prefix, supported_input_formats()))
+        from calibre.web.feeds.recipes import recipes
+        ans += [t.title+'.recipe ' for t in recipes if
+                (t.title+'.recipe').startswith(self.prefix)]
+        send(ans)
+
+    def complete_output(self):
+        from calibre.customize.ui import available_output_formats
+        fmts = available_output_formats()
+        ans = list(files_and_dirs(self.prefix, fmts))
+        ans += ['.'+x+' ' for x in fmts if ('.'+x).startswith(self.prefix)]
+        send(ans)
+
+
+
+
+
+
+def main(args=sys.argv):
+    comp_line, pos = os.environ['COMP_LINE'], int(os.environ['COMP_POINT'])
+    module = split(comp_line)[0].split(os.sep)[-1]
+    if module == 'ebook-convert':
+        EbookConvert(comp_line, pos)
+
+    return 0
+
+
+if __name__ == '__main__':
+    raise sys.exit(main())