SSH access AWS EC2 - Script Authorized keys for EC2

gistfile1.eclass

#bin/sh

#  Script to authorize EC2 instance
#  You can use id_rsa or id_dsa, i'm using id_rsa then:
#  PEM_FILE must be seted

KEY="$HOME/.ssh/id_rsa.pub"
PEM_FILE=""

if [ ! -f $KEY ];then
  echo "private key not found at $KEY"
  echo "* please create it with \"ssh-keygen -t rsa\" *"
  exit
fi

if [ -z $1 ];then
  echo "Usage: $0 username@host"
	exit
fi
if [ "$PEM_FILE" == "" ];then
  echo "PEM_FILE must be seted, please open script and set env PEM_FILE"
	exit
	if [ -f $PEM_FILE ];then
		echo 'File do not exist please set env PEM_FILE correctly'
 		exit
	fi
fi

echo "Putting your key on $1... "
ssh -i $PEM_FILE -q $* "umask 0077; mkdir -p ~/.ssh ; echo \"`cat $KEY`\" >> ~/.ssh/authorized_keys"
echo "done!"