sendkey.sh

#!/bin/bash
#
# sendkey.sh: Helps proliferate your SSH public key to hosts.
#
# Rick Branson <rick@diodeware.com>
# This code is released into the public domain.
#

if [ "$#" -lt 1 ]; then
  echo "sendkey.sh: Sends id_rsa.pub as authorized_keys to remote host (over SSH)"
  echo "Usage: sendkey.sh <[user@]host>"
  exit 2
fi

if [ ! -f "$HOME/.ssh/id_rsa.pub" ]; then
  echo "You don't have an id_rsa.pub file, use ssh-keygen to create one!"
  exit 3
fi

echo
echo "=== PUSHING FILES ==="
echo
echo "You will be prompted to enter your password below to push your"
echo "authorized_keys file to the remote host."
echo 

PUBLIC_KEY=`cat $HOME/.ssh/id_rsa.pub`

ssh $1 <<__EOT__

echo ""

if [ ! -d "\$HOME/.ssh" ]; then
  echo "REMOTE: No .ssh directory, creating it..."
  mkdir -p \$HOME/.ssh
  chmod 755 \$HOME/.ssh
fi

echo "REMOTE: Adding key to authorized_keys file..."
echo "$PUBLIC_KEY" >> \$HOME/.ssh/authorized_keys

__EOT__

echo
echo "=== TESTING ==="

echo
echo "If you get an error below, something went wrong!"
echo

ssh -o "PasswordAuthentication=no" $1 "echo \"... but it didn't go wrong, it worked!\""

echo