#!/bin/bash

start_rev=$1
end_rev=$2
cmd=$3


function main()
{
  revs=`git rev-list --topo-order --reverse ${start_rev}..${end_rev}`
  for rev in $revs; do
    git checkout --quiet $rev
    eval $cmd
    git reset --hard --quiet
  done
  git checkout ${end_rev}
}

main "$@"