step by step shell

return_yes=0
return_reload=1
return_no=2
return_skip=3

do_promote ( ) {
  command=${1}
  promote=${2:-$1}
  echo ""
  echo "${promote}: [y]es or [s]kip? or [r]epeat last step?" && echo "$command" && read x
  case "${x}" in
  y|Y)
    eval "$command"
    return ${return_yes}
    ;;
  r|R)
#do nothing bu need to decrease "i" by 2 in the circle
    return ${return_reload}
    ;;
  s|S)
#nothing to do
    return ${return_skip}
    ;;
  *)
    return ${return_no}
    ;;
  esac
}

    echo ""
    echo "major version: ${major_version}"
    echo "svn revision:  ${revision}"
    echo -e "respond y as \"yes\"; s as \"skip\"; and r as \"reload\", any other inpute will lead to exit\n"

do_step0 ( ) {
    do_promote "date" "** Ready to go upgrading ads"
    return $?
}

do_step1 ( ) {
    do_promote "sudo -u eng /opt/freewheel/scripts/rsync_build.sh ads ${rsync_version}" "1.Syncing the builds from build server"
    return $?
}

for ((i=0;i<10;i++)) do
    do_step${i}
    return_code=$?
    [ $return_code -eq $return_no ] && exit $return_no
    [ $return_code -eq $return_reload ] && i=$(($i-2))
done