# File lib/bee_task_default.rb, line 1174
      def gunzip(parameters)
        require 'zlib'
        # parse parameters
        params_desc = {
          :src  => { :mandatory => true,  :type => :string },
          :dest => { :mandatory => false, :type => :string }
        }
        check_parameters(parameters, params_desc)
        src  = parameters[:src]
        dest = parameters[:dest]
        error "gunzip 'src' parameter must be an readable GZIP archive" unless
          File.exists?(src) and File.readable?(src)
        if not dest
          if src =~ /.*\.gz$/
            dest = src[0..-4]
          elsif src =~ /.*\.gzip$/
            dest = src[0..-6]
          elsif src =~ /.*\.tgz/
            dest = src[0..-5]+'.tar'
          else
            error "gunzip can't guess 'dest' parameter from 'src' file name"
          end
        end
        # expand file
        puts "Expanding GZIP archive '#{dest}'"
        begin
          Zlib::GzipReader.open(src) do |input|
            output = File.open(dest, 'wb')
            output.write(input.read)
            output.close
          end
        rescue
          error "Error expanding GZIP archive: #{$!}"
        end
      end