def options(opt)
opt.on :a, :all, "Display all history"
opt.on :H, :head, "Display the first N items", :optional_argument => true, :as => Integer
opt.on :T, :tail, "Display the last N items", :optional_argument => true, :as => Integer
opt.on :s, :show, "Show the given range of lines", :optional_argument => true, :as => Range
opt.on :G, :grep, "Show lines matching the given pattern", :argument => true, :as => String
opt.on :c, :clear , "Clear the current session's history"
opt.on :r, :replay, "Replay a line or range of lines", :argument => true, :as => Range
opt.on :save, "Save history to a file", :argument => true, :as => Range
opt.on :e, 'exclude-pry''exclude-pry', "Exclude Pry commands from the history"
opt.on :n, 'no-numbers''no-numbers', "Omit line numbers"
end