diff --git a/pubs/commands/add_cmd.py b/pubs/commands/add_cmd.py
index 95a07a2..8c5db77 100644
--- a/pubs/commands/add_cmd.py
+++ b/pubs/commands/add_cmd.py
@@ -9,7 +9,7 @@ from .. import color
 from .. import pretty
 
 
-def parser(subparsers):
+def parser(subparsers, conf):
     parser = subparsers.add_parser('add', help='add a paper to the repository')
     parser.add_argument('bibfile', nargs='?', default=None,
                         help='bibtex file')
diff --git a/pubs/commands/conf_cmd.py b/pubs/commands/conf_cmd.py
index 1f5ba44..eceaf8d 100644
--- a/pubs/commands/conf_cmd.py
+++ b/pubs/commands/conf_cmd.py
@@ -3,7 +3,7 @@ from .. import config
 from .. import content
 
 
-def parser(subparsers):
+def parser(subparsers, conf):
     parser = subparsers.add_parser('conf',
             help='open the configuration in an editor')
     return parser
@@ -17,7 +17,7 @@ def command(conf, args):
         # get modif from user
         ui.edit_file(config.get_confpath())
 
-        new_conf = config.load_conf(check=False)
+        new_conf = config.load_conf()
         try:
             config.check_conf(new_conf)
             ui.message('The configuration file was updated.')
diff --git a/pubs/commands/doc_cmd.py b/pubs/commands/doc_cmd.py
index 96bcf0f..c8f34eb 100644
--- a/pubs/commands/doc_cmd.py
+++ b/pubs/commands/doc_cmd.py
@@ -6,6 +6,8 @@ from .. import color
 from ..uis import get_ui
 from .. import content
 from ..utils import resolve_citekey, resolve_citekey_list
+from ..completion import CiteKeyCompletion
+
 
 # doc --+- add $file $key [[-L|--link] | [-M|--move]] [-f|--force]
 #       +- remove $key [$key [...]] [-f|--force]
@@ -13,35 +15,46 @@ from ..utils import resolve_citekey, resolve_citekey_list
 #       +- open $key [-w|--with $cmd]
 # supplements attach, open
 
-def parser(subparsers):
-    doc_parser = subparsers.add_parser('doc', help='manage the document relating to a publication')
-    doc_subparsers = doc_parser.add_subparsers(title='document actions', help='actions to interact with the documents',
-                                               dest='action')
+def parser(subparsers, conf):
+    doc_parser = subparsers.add_parser(
+        'doc',
+        help='manage the document relating to a publication')
+    doc_subparsers = doc_parser.add_subparsers(
+        title='document actions', dest='action',
+        help='actions to interact with the documents')
     doc_subparsers.required = True
 
     add_parser = doc_subparsers.add_parser('add', help='add a document to a publication')
     add_parser.add_argument('-f', '--force', action='store_true', dest='force', default=False,
-                           help='force overwriting an already assigned document')
+                            help='force overwriting an already assigned document')
     add_parser.add_argument('document', nargs=1, help='document file to assign')
-    add_parser.add_argument('citekey', nargs=1, help='citekey of the publication')
+    add_parser.add_argument('citekey', nargs=1, help='citekey of the publication'
+                            ).completer = CiteKeyCompletion(conf)
     add_exclusives = add_parser.add_mutually_exclusive_group()
-    add_exclusives.add_argument('-L', '--link', action='store_false', dest='link', default=False,
-                           help='do not copy document files, just create a link')
-    add_exclusives.add_argument('-M', '--move', action='store_true', dest='move', default=False,
-                           help='move document instead of of copying (ignored if --link)')
+    add_exclusives.add_argument(
+        '-L', '--link', action='store_false', dest='link', default=False,
+        help='do not copy document files, just create a link')
+    add_exclusives.add_argument(
+        '-M', '--move', action='store_true', dest='move', default=False,
+        help='move document instead of of copying (ignored if --link)')
 
     remove_parser = doc_subparsers.add_parser('remove', help='remove assigned documents from publications')
-    remove_parser.add_argument('citekeys', nargs='+', help='citekeys of the publications')
-    remove_parser.add_argument('-f', '--force', action='store_true', dest='force', default=False,
-                              help='force removing assigned documents')
+    remove_parser.add_argument('citekeys', nargs='+', help='citekeys of the publications'
+                               ).completer = CiteKeyCompletion(conf)
+    remove_parser.add_argument('-f', '--force', action='store_true', dest='force',
+                               default=False,
+                               help='force removing assigned documents')
 
     # favor key+ path  over:  key
     export_parser = doc_subparsers.add_parser('export', help='export assigned documents to given path')
-    export_parser.add_argument('citekeys', nargs='+', help='citekeys of the documents to export')
+    export_parser.add_argument('citekeys', nargs='+',
+                               help='citekeys of the documents to export'
+                               ).completer = CiteKeyCompletion(conf)
     export_parser.add_argument('path', nargs=1, help='directory to export the files to')
 
     open_parser = doc_subparsers.add_parser('open', help='open an assigned document')
-    open_parser.add_argument('citekey', nargs=1, help='citekey of the document to open')
+    open_parser.add_argument('citekey', nargs=1, help='citekey of the document to open'
+                             ).completer = CiteKeyCompletion(conf)
     open_parser.add_argument('-w', '--with', dest='cmd', help='command to open the file with')
 
     return doc_parser
diff --git a/pubs/commands/edit_cmd.py b/pubs/commands/edit_cmd.py
index 60f04d6..0af4e5e 100644
--- a/pubs/commands/edit_cmd.py
+++ b/pubs/commands/edit_cmd.py
@@ -4,15 +4,19 @@ from .. import repo
 from ..uis import get_ui
 from ..endecoder import EnDecoder
 from ..utils import resolve_citekey
+from ..completion import CiteKeyCompletion
 
 
-def parser(subparsers):
-    parser = subparsers.add_parser('edit',
-            help='open the paper bibliographic file in an editor')
-    parser.add_argument('-m', '--meta', action='store_true', default=False,
-            help='edit metadata')
-    parser.add_argument('citekey',
-            help='citekey of the paper')
+def parser(subparsers, conf):
+    parser = subparsers.add_parser(
+        'edit',
+        help='open the paper bibliographic file in an editor')
+    parser.add_argument(
+        '-m', '--meta', action='store_true', default=False,
+        help='edit metadata')
+    parser.add_argument(
+        'citekey',
+        help='citekey of the paper').completer = CiteKeyCompletion(conf)
     return parser
 
 
diff --git a/pubs/commands/export_cmd.py b/pubs/commands/export_cmd.py
index 54e48f8..1224a03 100644
--- a/pubs/commands/export_cmd.py
+++ b/pubs/commands/export_cmd.py
@@ -4,12 +4,15 @@ from .. import repo
 from ..uis import get_ui
 from .. import endecoder
 from ..utils import resolve_citekey_list
+from ..completion import CiteKeyCompletion
 
-def parser(subparsers):
+
+def parser(subparsers, conf):
     parser = subparsers.add_parser('export', help='export bibliography')
     # parser.add_argument('-f', '--bib-format', default='bibtex',
     #         help='export format')
-    parser.add_argument('citekeys', nargs='*', help='one or several citekeys')
+    parser.add_argument('citekeys', nargs='*', help='one or several citekeys'
+                        ).completer = CiteKeyCompletion(conf)
     return parser
 
 
diff --git a/pubs/commands/import_cmd.py b/pubs/commands/import_cmd.py
index 990fc8c..03935b4 100644
--- a/pubs/commands/import_cmd.py
+++ b/pubs/commands/import_cmd.py
@@ -11,7 +11,7 @@ from ..uis import get_ui
 from ..content import system_path, read_text_file
 
 
-def parser(subparsers):
+def parser(subparsers, conf):
     parser = subparsers.add_parser('import',
             help='import paper(s) to the repository')
     parser.add_argument('bibpath',
diff --git a/pubs/commands/init_cmd.py b/pubs/commands/init_cmd.py
index f4f2a4c..322800e 100644
--- a/pubs/commands/init_cmd.py
+++ b/pubs/commands/init_cmd.py
@@ -9,7 +9,8 @@ from ..repo import Repository
 from ..content import system_path, check_directory
 from .. import config
 
-def parser(subparsers):
+
+def parser(subparsers, conf):
     parser = subparsers.add_parser('init',
                                    help="initialize the pubs directory")
     parser.add_argument('-p', '--pubsdir', default=None,
diff --git a/pubs/commands/list_cmd.py b/pubs/commands/list_cmd.py
index 6901f08..5884cdc 100644
--- a/pubs/commands/list_cmd.py
+++ b/pubs/commands/list_cmd.py
@@ -10,7 +10,7 @@ class InvalidQuery(ValueError):
     pass
 
 
-def parser(subparsers):
+def parser(subparsers, conf):
     parser = subparsers.add_parser('list', help="list papers")
     parser.add_argument('-k', '--citekeys-only', action='store_true',
             default=False, dest='citekeys',
diff --git a/pubs/commands/note_cmd.py b/pubs/commands/note_cmd.py
index 8e1fab1..696f99d 100644
--- a/pubs/commands/note_cmd.py
+++ b/pubs/commands/note_cmd.py
@@ -2,19 +2,19 @@ from .. import repo
 from .. import content
 from ..uis import get_ui
 from ..utils import resolve_citekey
+from ..completion import CiteKeyCompletion
 
 
-def parser(subparsers):
+def parser(subparsers, conf):
     parser = subparsers.add_parser('note',
-            help='edit the note attached to a paper')
+                                   help='edit the note attached to a paper')
     parser.add_argument('citekey',
-            help='citekey of the paper')
+                        help='citekey of the paper'
+                        ).completer = CiteKeyCompletion(conf)
     return parser
 
 
 def command(conf, args):
-    """
-    """
 
     ui = get_ui()
     rp = repo.Repository(conf)
diff --git a/pubs/commands/remove_cmd.py b/pubs/commands/remove_cmd.py
index 83785e2..cbeb9e9 100644
--- a/pubs/commands/remove_cmd.py
+++ b/pubs/commands/remove_cmd.py
@@ -3,13 +3,16 @@ from .. import color
 from ..uis import get_ui
 from ..utils import resolve_citekey_list
 from ..p3 import ustr
+from ..completion import CiteKeyCompletion
 
-def parser(subparsers):
+
+def parser(subparsers, conf):
     parser = subparsers.add_parser('remove', help='removes a publication')
     parser.add_argument('-f', '--force', action='store_true', default=None,
                         help="does not prompt for confirmation.")
     parser.add_argument('citekeys', nargs='+',
-                        help="one or several citekeys")
+                        help="one or several citekeys"
+                        ).completer = CiteKeyCompletion(conf)
     return parser
 
 
diff --git a/pubs/commands/rename_cmd.py b/pubs/commands/rename_cmd.py
index dd4b903..ae08f51 100644
--- a/pubs/commands/rename_cmd.py
+++ b/pubs/commands/rename_cmd.py
@@ -2,13 +2,15 @@ from ..uis import get_ui
 from .. import color
 from .. import repo
 from ..utils import resolve_citekey
+from ..completion import CiteKeyCompletion
 
-def parser(subparsers):
-    parser = subparsers.add_parser('rename', help='rename the citekey of a repository')
-    parser.add_argument('citekey',
-                        help='current citekey')
-    parser.add_argument('new_citekey',
-                        help='new citekey')
+
+def parser(subparsers, conf):
+    parser = subparsers.add_parser('rename',
+                                   help='rename the citekey of a repository')
+    parser.add_argument('citekey', help='current citekey'
+                        ).completer = CiteKeyCompletion(conf)
+    parser.add_argument('new_citekey', help='new citekey')
     return parser
 
 
@@ -26,7 +28,7 @@ def command(conf, args):
     paper = rp.pull_paper(key)
     rp.rename_paper(paper, args.new_citekey)
     ui.message("The '{}' citekey has been renamed into '{}'".format(
-                color.dye_out(args.citekey, 'citekey'),
-                color.dye_out(args.new_citekey, 'citekey')))
+        color.dye_out(args.citekey, 'citekey'),
+        color.dye_out(args.new_citekey, 'citekey')))
 
     rp.close()
diff --git a/pubs/commands/tag_cmd.py b/pubs/commands/tag_cmd.py
index 5ce91a7..b5031f9 100644
--- a/pubs/commands/tag_cmd.py
+++ b/pubs/commands/tag_cmd.py
@@ -24,15 +24,17 @@ from ..uis import get_ui
 from .. import pretty
 from .. import color
 from ..utils import resolve_citekey
+from ..completion import CiteKeyOrTagCompletion, TagModifierCompletion
 
 
-def parser(subparsers):
+def parser(subparsers, conf):
     parser = subparsers.add_parser('tag', help="add, remove and show tags")
     parser.add_argument('citekeyOrTag', nargs='?', default=None,
-                        help='citekey or tag.')
+                        help='citekey or tag.').completer = CiteKeyOrTagCompletion(conf)
     parser.add_argument('tags', nargs='?', default=None,
                         help='If the previous argument was a citekey, then '
-                             'a list of tags separated by a +.')
+                             'a list of tags separated by + and -.'
+                        ).completer = TagModifierCompletion(conf)
     # TODO find a way to display clear help for multiple command semantics,
     #      indistinguisable for argparse. (fabien, 201306)
     return parser
@@ -70,6 +72,7 @@ def _tag_groups(tags):
             minus_tags.append(tag[1:])
     return set(plus_tags), set(minus_tags)
 
+
 def command(conf, args):
     """Add, remove and show tags"""
 
diff --git a/pubs/commands/websearch_cmd.py b/pubs/commands/websearch_cmd.py
index ee7ee20..7599f0d 100644
--- a/pubs/commands/websearch_cmd.py
+++ b/pubs/commands/websearch_cmd.py
@@ -3,7 +3,8 @@ import urllib
 
 from ..uis import get_ui
 
-def parser(subparsers):
+
+def parser(subparsers, conf):
     parser = subparsers.add_parser('websearch',
                                    help="launch a search on Google Scholar")
     parser.add_argument("search_string", nargs = '*',
diff --git a/pubs/completion.py b/pubs/completion.py
new file mode 100644
index 0000000..0b2054c
--- /dev/null
+++ b/pubs/completion.py
@@ -0,0 +1,59 @@
+import re
+try:
+    import argcomplete
+except ImportError:
+
+    class FakeModule:
+
+        @staticmethod
+        def _fun(*args, **kwargs):
+            pass
+
+        def __getattr__(self, _):
+            return self._fun
+
+    argcomplete = FakeModule()
+
+from . import repo
+
+
+def autocomplete(parser):
+    argcomplete.autocomplete(parser)
+
+
+class BaseCompleter(object):
+
+    def __init__(self, conf):
+        self.conf = conf
+
+    def __call__(self, **kwargs):
+        try:
+            return self._complete(**kwargs)
+        except Exception as e:
+            argcomplete.warn(e)
+
+
+class CiteKeyCompletion(BaseCompleter):
+
+    def _complete(self, **kwargs):
+        rp = repo.Repository(self.conf)
+        return rp.citekeys
+
+
+class CiteKeyOrTagCompletion(BaseCompleter):
+
+    def _complete(self, **kwargs):
+        rp = repo.Repository(self.conf)
+        return rp.citekeys.union(rp.get_tags())
+
+
+class TagModifierCompletion(BaseCompleter):
+
+    regxp = r"[^:+-]*$"  # prefix of tag after last separator
+
+    def _complete(self, prefix, **kwargs):
+        tags = repo.Repository(self.conf).get_tags()
+        start, _ = re.search(self.regxp, prefix).span()
+        partial_expr = prefix[:start]
+        t_prefix = prefix[start:]
+        return [partial_expr + t for t in tags if t.startswith(t_prefix)]
diff --git a/pubs/config/__init__.py b/pubs/config/__init__.py
index 0f5a133..3e8ec08 100644
--- a/pubs/config/__init__.py
+++ b/pubs/config/__init__.py
@@ -1,2 +1,3 @@
-from .conf import get_confpath, load_default_conf, load_conf, save_conf, check_conf
+from .conf import (get_confpath, load_default_conf, load_conf, save_conf,
+                   check_conf, ConfigurationNotFound)
 from .conf import default_open_cmd, post_process_conf
diff --git a/pubs/config/conf.py b/pubs/config/conf.py
index af2f3ce..2086601 100644
--- a/pubs/config/conf.py
+++ b/pubs/config/conf.py
@@ -1,7 +1,5 @@
 import os
 import platform
-import shutil
-
 
 import configobj
 import validate
@@ -11,6 +9,16 @@ from .spec import configspec
 
 DFT_CONFIG_PATH = os.path.expanduser('~/.pubsrc')
 
+
+class ConfigurationNotFound(IOError):
+
+    def __init__(self, path):
+        super(ConfigurationNotFound, self).__init__(
+            "No configuration found at path {}. Maybe you need to initialize "
+            "your repository with `pubs init` or specify a --config argument."
+            "".format(path))
+
+
 def post_process_conf(conf):
     """Do some post processing on the configuration"""
     if conf['main']['docsdir'] == 'docsdir://':
@@ -50,14 +58,14 @@ def check_conf(conf):
     assert results == True, '{}'.format(results) # TODO: precise error dialog when parsing error
 
 
-def load_conf(check=True, path=None):
+def load_conf(path=None):
     """Load the configuration"""
     if path is None:
         path = get_confpath(verify=True)
+    if not os.path.exists(path):
+        raise ConfigurationNotFound(path)
     with open(path, 'rb') as f:
         conf = configobj.ConfigObj(f.readlines(), configspec=configspec)
-    if check:
-        check_conf(conf)
     conf.filename = path
     conf = post_process_conf(conf)
     return conf
diff --git a/pubs/plugins.py b/pubs/plugins.py
index 17e2256..c888715 100644
--- a/pubs/plugins.py
+++ b/pubs/plugins.py
@@ -14,7 +14,7 @@ class PapersPlugin(object):
 
     name = None
 
-    def get_commands(self, subparsers):
+    def get_commands(self, subparsers, conf):
         """Populates the parser with plugins specific command.
         Returns iterable of pairs (command name, command function to call).
         """
diff --git a/pubs/plugs/alias/alias.py b/pubs/plugs/alias/alias.py
index eebf1f9..7a75467 100644
--- a/pubs/plugs/alias/alias.py
+++ b/pubs/plugs/alias/alias.py
@@ -65,7 +65,7 @@ class AliasPlugin(PapersPlugin):
             for name, definition in conf['plugins']['alias'].items():
                 self.aliases.append(Alias.create_alias(name, definition))
 
-    def update_parser(self, subparsers):
+    def update_parser(self, subparsers, conf):
         """Add subcommand to the provided subparser"""
         for alias in self.aliases:
             alias_parser = alias.parser(subparsers)
diff --git a/pubs/pubs b/pubs/pubs
index 7699f18..68fd3d7 100755
--- a/pubs/pubs
+++ b/pubs/pubs
@@ -1,5 +1,6 @@
 #!/usr/bin/env python
 # -*- coding:utf-8 -*-
+# PYTHON_ARGCOMPLETE_OK
 
 from pubs import pubs_cmd
 
diff --git a/pubs/pubs_cmd.py b/pubs/pubs_cmd.py
index 5b93893..bd956cc 100644
--- a/pubs/pubs_cmd.py
+++ b/pubs/pubs_cmd.py
@@ -7,6 +7,7 @@ from . import commands
 from . import update
 from . import plugins
 from .__init__ import __version__
+from .completion import autocomplete
 
 
 CORE_CMDS = collections.OrderedDict([
@@ -49,15 +50,18 @@ def execute(raw_args=sys.argv):
             conf_path = config.get_confpath(verify=False)  # will be checked on load
 
         # Loading config
-        if len(remaining_args) > 0 and remaining_args[0] != 'init':
-            conf = config.load_conf(path=conf_path, check=False)
+        try:
+            conf = config.load_conf(path=conf_path)
             if update.update_check(conf, path=conf.filename):
                 # an update happened, reload conf.
-                conf = config.load_conf(path=conf_path, check=False)
+                conf = config.load_conf(path=conf_path)
             config.check_conf(conf)
-        else:
-            conf = config.load_default_conf()
-            conf.filename = conf_path
+        except config.ConfigurationNotFound:
+            if len(remaining_args) == 0 or remaining_args[0] == 'init':
+                conf = config.load_default_conf()
+                conf.filename = conf_path
+            else:
+                raise
 
         uis.init_ui(conf, force_colors=top_args.force_colors)
         ui = uis.get_ui()
@@ -70,14 +74,16 @@ def execute(raw_args=sys.argv):
 
         # Populate the parser with core commands
         for cmd_name, cmd_mod in CORE_CMDS.items():
-            cmd_parser = cmd_mod.parser(subparsers)
+            cmd_parser = cmd_mod.parser(subparsers, conf)
             cmd_parser.set_defaults(func=cmd_mod.command)
 
         # Extend with plugin commands
         plugins.load_plugins(conf, ui)
         for p in plugins.get_plugins().values():
-            p.update_parser(subparsers)
+            p.update_parser(subparsers, conf)
 
+        # Eventually autocomplete
+        autocomplete(parser)
         # Parse and run appropriate command
         args = parser.parse_args(remaining_args)
         args.prog = "pubs"  # FIXME?
diff --git a/pubs/update.py b/pubs/update.py
index aab8879..1fb983f 100644
--- a/pubs/update.py
+++ b/pubs/update.py
@@ -1,6 +1,7 @@
 import shutil
 
 import io
+import sys
 from . import config
 from . import uis
 from . import color
@@ -33,6 +34,7 @@ def update_check(conf, path=None):
 
     return False
 
+
 def update(conf, code_version, repo_version, path=None):
     """Runs an update if necessary, and return True in that case."""
     if path is None:
diff --git a/readme.md b/readme.md
index dfe19b4..074bde9 100644
--- a/readme.md
+++ b/readme.md
@@ -15,18 +15,20 @@ Pubs is built with the following principles in mind:
 
 ## Installation
 
-Until pubs is uploaded to Pypi, the standard way to install it is to clone the repository and call `setup.py`.
+Currently, the Pypi version is outdated. You can install the development version of `pubs`, which should be stable, with:
 
-    git clone https://github.com/pubs/pubs.git
-    cd pubs
-    sudo python setup.py install # remove sudo and add --user for local installation instead
+    pip install --upgrade git+https://github.com/pubs/pubs
+
+If `pubs` is already installed, you can upgrade with:
+
+    pip install --upgrade git+https://github.com/pubs/pubs
 
 Alternatively Arch Linux users can also use the [pubs-git](https://aur.archlinux.org/packages/pubs-git/) AUR package.
 
 
 ## Getting started
 
-Create your library (by default, goes to '~/.pubs/').
+Create your library (by default, goes to `~/.pubs/`).
 
     pubs init
 
@@ -88,15 +90,29 @@ The first command defines a new subcommand: `pubs open -w evince` will be execut
 The second starts with a bang: `!`, and is treated as a shell command.
 
 
+## Autocompletion
+
+For autocompletion to work, you need the [argcomplete](https://argcomplete.readthedocs.io) Python package, and Bash 4.2 or newer. For activating *bash* or *tsch* completion, consult the [argcomplete documentation](https://argcomplete.readthedocs.io/en/latest/#global-completion).
+
+For *zsh* completion, the global activation is not supported but bash completion compatibility can be used for pubs. For that, add the following to your `.zshrc`:
+
+    # Enable and load bashcompinit
+    autoload -Uz compinit bashcompinit
+    compinit
+    bashcompinit
+    # Argcomplete explicit registration for pubs
+    eval "$(register-python-argcomplete pubs)"
+
+
 ## Need more help ?
 
-You can access the self-documented configuration by using `pubs conf`, and all the commands's help is available with the `--help` option. Did not find an answer to your question? Drop us an issue. We may not answer right away (science comes first!) but we'll eventually look into it.
+You can access the self-documented configuration by using `pubs conf`, and all the commands' help is available with the `--help` option. Did not find an answer to your question? Drop us an issue. We may not answer right away (science comes first!) but we'll eventually look into it.
 
 
 ## Requirements
 
 - python >= 2.7 or >= 3.3
-
+- [argcomplete](https://argcomplete.readthedocs.io) (optional, for autocompletion)
 
 ## Authors
 
diff --git a/tests/test_usecase.py b/tests/test_usecase.py
index 1120141..4c275d5 100644
--- a/tests/test_usecase.py
+++ b/tests/test_usecase.py
@@ -33,7 +33,7 @@ class FakeSystemExit(Exception):
     SystemExit exceptions are replaced by FakeSystemExit in the execute_cmds()
     function, so they can be catched by ExpectedFailure tests in Python 2.x.
 
-    If a code is accepted to raise SystemExit, catch FakeSystemExit instead.
+    If a code is expected to raise SystemExit, catch FakeSystemExit instead.
     """
     pass
 
@@ -151,6 +151,13 @@ class DataCommandTestCase(CommandTestCase):
 
 # Actual tests
 
+class TestAlone(CommandTestCase):
+
+    def test_alone_misses_command(self):
+        with self.assertRaises(FakeSystemExit):
+            self.execute_cmds(['pubs'])
+
+
 class TestInit(CommandTestCase):
 
     def test_init(self):