The previous fix to relax the regex was insufficient.
This is basically the diff proposed by Bryan Fink with
the difference of using 'C' instead of 'en_US'.

Reported-by: Manuel Duran Aguete <manuel@aguete.org>

rebar_utils:sh/2 terminates on error and does not return an error code
as expected.

2010-09-23 Juan Jose Comellas <juanjo@comellas.org>

  * Released v0.3.0
  * Added support for rebar.
  * Cleaned up dialyzer warnings.

--HG--
extra : rebase_source : 9eccc596d8

Rebar currently doesn't give any feedback on an invalid command. This change
makes rebar keep track of how many operations each command triggers, if a
particular command doesn't change the count, there were no modules implementing
it. If at the end of handling all commands, tje count is 0, none of the supplied
commands were valid and ?FAIL is called to trigger a non zero exit status.

Uses code:which or cover:is_compiled to get path the beam for chunks

--HG--
extra : rebase_source : 2f2b819e20

Replace rebar_util:get_cwd/0 by rebar_utils:get_cwd/0.  Luckily the
misspelt module name doesn't seem to have caused any harm, since
rebar_app_utils:is_app_dir/0 and rebar_rel_utils:is_rel_dir/0 aren't
called (only their /1 counterparts).