extract user story

gistfile1.scala

#!/bin/sh                                                                                                                                                                                    
exec scala -nc "$0" "$@"
!#

import scala.io._

val source = if(args.length>0) Source.fromFile(args(0)).getLines else Source.stdin.getLines
val pattern = """([a-zA-Z]+)-(\d+)""".r
source.flatMap(pattern.findFirstIn).toList.distinct.foreach(println)

//=============USAGE======================
you can git log > txt file, then pass the txt file path to this script
or 
you can pipe git log to it :   git log | script