sbt 0.7.4 supports command history

> !
History commands:
   !!    Execute the last command again
   !:    Show all previous commands
   !:n    Show the last n commands
   !n    Execute the command with index n, as shown by the !: command
   !-n    Execute the nth command before this one
   !string    Execute the most recent command starting with 'string'
   !?string    Execute the most recent command containing 'string'
>