Script to automatically setup password less ssh login

pwdless-ssh.sh

#!/bin/bash

usage() { echo "Usage: $0 -L [-U <user_name>] [-H <host>] [-h <hostname>] " 1>&2; exit 1; }

# Input

login=false # Open ssh session after set up, defaults to false.
while getopts "h:U:H:L" opt; do
    case $opt in
        U) user=$OPTARG ;;
        H) host=$OPTARG ;;
        h) hostname=$OPTARG ;;
        L) login=true ;;
        *) usage ;;
    esac
done

shift $(($OPTIND - 1))

if [ -z $user ] || [ -z $host ] || [ -z $hostname ]; then
    usage
fi

# Input end

echo "Working the magic.."

key_content=`cat .ssh/id_rsa.pub`
ssh $user@$host "mkdir -p .ssh && 
                 echo $key_content >> .ssh/authorized_keys &&
                 chmod -R 700 .ssh &&
                 chmod 640 .ssh/authorized_keys"
code=$?
if [ $code -ne 0 ]; then
    echo "Failed. Check your ssh access and permissions."
    exit 1
fi

echo -e "Host $hostname\n\t Hostname $host\n\t User $user" >> ~/.ssh/config
echo -e "It worked.\nYou can now ssh to $hostname as $user without a password."

if $login; then
    echo "Beginning ssh session."
    ssh $user@$host
    exit 0
fi