anchor.diff:          [Jobs]),
       [
        %% {Name, ShortOpt, LongOpt, ArgSpec, HelpMsg}
  -     {help,    $h, "help",    undefined, "Show the program options"},
  -     {verbose, $v, "verbose", undefined, "Be verbose about what gets done"},
  -     {force,   $f, "force",   undefined, "Force"},
  -     {jobs,    $j, "jobs",    integer, JobsHelp}
  +     {help,     $h, "help",     undefined, "Show the program options"},
  +     {commands, $c, "commands", undefined, "Show available commands"},
  +     {verbose,  $v, "verbose",  undefined, "Be verbose about what gets done"},
  +     {force,    $f, "force",    undefined, "Force"},
  +     {jobs,     $j, "jobs",     integer,   JobsHelp}
       ].
   
   %%
  
positive.code:     rebar_config:set_global(Flag, Value).
  
  %%
  %% print help/usage string
  %%
  help() ->
  
negative.code:                  "[var=value,...] <command,...>",
                   [{"var=value", "rebar global variables (e.g. force=1)"},
                    {"command", "Command to run (e.g. compile)"}]).
  
  %%
  %% print known commands
  %%
  commands() ->
      io:format(<<
  "analyze                              Analyze with Dialyzer~n"
  "build_plt                            Build Dialyzer PLT~n"
  "check_plt                            Check Dialyzer PLT~n"
  "~n"
  "clean                                Clean~n"
  "compile                              Compile sources~n"
  "~n"
  "create      template= [var=foo,...]  Create skel based on template and vars~n"
  "create-app                           Create simple app skel~n"
  "create-node                          Create simple node skel~n"
  "~n"
  "generate    [dump_spec=0/1]          Build release with reltool~n"
  "install     [target=]                Install build into target~n"
  "~n"
  "eunit       [suite=foo]              Run eunit [test/foo_tests.erl] tests~n"
  "~n"
  "int_test    [suite=] [case=]         Run ct suites in ./int_test~n"
  "perf_test   [suite=] [case=]         Run ct suites in ./perf_test~n"
  "test        [suite=] [case=]         Run ct suites in ./test~n"
  >>).
  
  %%
  %% options accepted via getopt
  