Upload local id_rsa.pub to remote .ssh/authorized_keys

sshkey2remote.sh

#!/bin/sh
#
# Author: Peter Toi
# Source: https://gist.github.com/petertoi/24b598eb269fac767cc7
#
# Usage 1: $ sshkey2remote.sh			# No argument will result in prompts
# Usage 2: $ sshkey2remote.sh user@host 	# Skip the prompts by including the argument

if [ "$#" -eq 1 ]
then
	userhost=$1
else
	echo "Remote User: "
	read user
	echo "Remote Host: "
	read host
	userhost=$user@$host
fi

([ -f ~/.ssh/id_rsa.pub ] || ssh-keygen -t rsa ) && (ssh $userhost "([ -d ~/.ssh ]||mkdir -m 700 ~/.ssh) && cat >> ~/.ssh/authorized_keys && chmod 600 ~/.ssh/authorized_keys" < ~/.ssh/id_rsa.pub)