anchor.diff:  (define-command bgrewriteaof "Rewrite the append only file in the background when it gets too big.")
   
   ;; Remote server control commands
  +;; TODO: new config, debug, eval, evalsha, new info, migrate, monitor, object, script, slowlog
   
   (define-command info "Provide information and statistics about the server")
   (define-command slaveof (host :string) (port :integer) "Change the replication settings.")
   (define-command config "Configure a redis server at runtime.")
  -
  -;; Undocumented in command reference
  -
  +(define-command echo (message :string) "Echo the given string.")
   (define-command ping "Ping the redis server.")
  +(define-command time "Return the current server time.")
  
positive.code:    #:renamenx
     #:dbsize
     #:expire
     #:ttl
     #:select
     #:move
     #:flushdb
     #:flushall
     ;; Commands operating on string values (incl. pseudo-integers)
     #:set
     #:get
  
negative.code:    #:decrby
     #:append
     #:substr
     #:bitcount
     #:getbit
     #:setbit
     #:getrange
     #:setrange
     #:strlen
     #:psetex
     ;; Commands operating on lists
     #:rpush
     #:rpushx
     #:lpush
     #:lpushx
     #:llen
     #:lrange
     #:ltrim
  