ec2-ssh

#!/bin/sh
set -e
ssh='ssh'
ec2din="ec2-describe-instances"

while [ $# -gt 0 ]; do
  case $1 in
    -*)
      if [ -z "$2" ]; then
        break
      elif [ "${2:0:1}" == "-" ]; then
        args="$args $1"
        shift
      else
        args="$args $1 $2"
        shift 2
      fi
      ;;
    *)
      if [ -n "$1" -a -z "$name" ]; then
        name=$1
        shift
      fi
      break
  esac
done

if [ -n "$name" ]; then

  if [ "$name" != "${name%\#*}" ]; then
    num=${name#*\#}
    name=${name%\#*}
  fi

  [ -z "$num" ] && num=1

  if [ "$name" != "${name%@*}" ]; then
    user=${name%@*}
    name=${name#*@}
  fi

  q="-F \"tag:Name=$name\""
  host=`$ec2din $q --hide-tags | grep ^INSTANCE | cut -f4 | paste -s | cut -f$num`

  if [ -n "$host" ]; then
    echo $host >&2
  else
    echo ec2-ssh: Could not find ec2 instance $name [$num] >&2
    exit 1
  fi
fi

if [ -n "$user" ]; then
  exec $ssh $args $user@$host $@
else
  exec $ssh $args $host $@
fi