def clean_library_commands
      aliases = @commands_hash.select {|k,v| @commands.include?(k) }.
        map {|k,v| v[:alias] }.compact
      @commands -= aliases
      @commands.uniq!
    end
def clean_library_commands
      aliases = @commands_hash.select {|k,v| @commands.include?(k) }.
        map {|k,v| v[:alias] }.compact
      @commands -= aliases
      @commands.uniq!
    end
Cleans @commands from set_library_commands