consume! (Net::SSH::Buffer)

         # File lib/net/ssh/buffer.rb, line 128
    128:     def consume!(n=position)
    129:       if n >= length
    130:         # optimize for a fairly common case
    131:         clear!
    132:       elsif n > 0
    133:         @content = @content[n..-1] || ""
    134:         @position -= n
    135:         @position = 0 if @position < 0
    136:       end
    137:       self
    138:     end