Easy way to add an alias to bash profile

add_ssh_alias.sh

#!/bin/bash
echo 'Lets add a new SSH alias\n\n'
read -n 1 -s -r -p "[Press any key to continue]"

echo '\n\n'
echo 'Alias Name (my ssh)'
read aliasname

echo 'Username (OS specific. eg Ubuntu:ubuntu AmazonLinux:ec2-user)'
read username

echo 'Host-name (address eg. ec2-35-182-252-128.ca-central-1.compute.amazonaws.com)'
read host

echo 'Key Location (path eg. ~/Keys/your-key.pem)'
read key 

chmod 400 $key
echo alias $aliasname=\"ssh -i $key $username@$host\"| cat - ~/.bash_profile > temp && mv temp ~/.bash_profile
echo 'ADDED: ' alias $aliasname="ssh -i $key $username@$hostssh -i $key $username@$host"
echo '\n[ COMPLETED ]\n\nPlese run \nsource ~/.bash_profile \nto activate your new alias\n\n'