anchor.diff:  usage() ->
       Usage = "~nUsage:
   
  -    search-cmd set_schema [INDEX] SCHEMAFILE : Set schema for an index.
  -    search-cmd show_schema [INDEX]           : Display the schema for an index.
  -    search-cmd clear_schema_cache            : Empty the schema cache on all nodes.
  +    search-cmd set-schema [INDEX] SCHEMAFILE : Set schema for an index.
  +    search-cmd show-schema [INDEX]           : Display the schema for an index.
  +    search-cmd clear-schema-cache            : Empty the schema cache on all nodes.
       search-cmd shell [INDEX]                 : Start the interactive Search shell.
       search-cmd search [INDEX] QUERY          : Perform a search.
  -    search-cmd search_doc [INDEX] QUERY      : Perform a document search.
  +    search-cmd search-doc [INDEX] QUERY      : Perform a document search.
       search-cmd explain [INDEX] QUERY         : Display an execution plan.
       search-cmd index [INDEX] PATH            : Index files in a path.
       search-cmd delete [INDEX] PATH           : De-index files in a path.
  
positive.code: 
  %% Serach Doc
  command([_CurDir, "search_doc", Query]) ->
      search_doc(?DEFAULT_INDEX, Query);
  command([_CurDir, "search_doc", Index, Query]) ->
      search_doc(Index, Query);
  
  %% Explain
  
negative.code: 
  %% Set Schema
  command([CurDir, "set_schema", SchemaFile]) ->
      command([CurDir, "set-schema", SchemaFile]);
  command([CurDir, "set-schema", SchemaFile]) ->
      SchemaFile1 = filename:join(CurDir, SchemaFile),
      set_schema(?DEFAULT_INDEX, SchemaFile1);
  command([CurDir, "set_schema", Index, SchemaFile]) ->
      command([CurDir, "set-schema", Index, SchemaFile]);
  command([CurDir, "set-schema", Index, SchemaFile]) ->
      SchemaFile1 = filename:join(CurDir, SchemaFile),
      set_schema(Index, SchemaFile1);
  
  %% Show Schema
  command([_CurDir, "show_schema"]) ->
      command([_CurDir, "show-schema"]);
  command([_CurDir, "show-schema"]) ->
      show_schema(?DEFAULT_INDEX);
  command([_CurDir, "show_schema", Index]) ->
      command([_CurDir, "show-schema", Index]);
  command([_CurDir, "show-schema", Index]) ->
      show_schema(Index);
  
  %% Clear Schema Cache
  command([_CurDir, "clear_schema_cache"]) ->
      command([_CurDir, "clear-schema-cache"]);
  command([_CurDir, "clear-schema-cache"]) ->
      clear_schema_cache();
  
  %% Shell
  