ssh-copy-id

#!/bin/sh

# Shell script to install your public key on a remote machine
# Takes the remote machine name as an argument.
# Obviously, the remote machine must accept password authentication,
# or one of the other keys in your ssh-agent, for this to work.
#
# Modified from https://github.com/beautifulcode/ssh-copy-id-for-OSX

ID_FILE="${HOME}/.ssh/id_rsa.pub"

for arg in "$@"
do
    case "$arg" in
      -i*)
        ID_FILE=`echo $arg | sed 's/-i//g'`
        LAST=idfile
        continue
            ;;
      -p*)
        PORT=`echo $arg | sed 's/-p//g'`
        LAST=port
        continue
            ;;
    *)
        if [ "$LAST" == "idfile" ] && [ 0 == `expr "$arg" : ^-`  ] ; then
          ID_FILE=$arg
        elif [ "$LAST" == "port" ] ; then
          PORT=$arg
        else
          REMOTE_SERVER=$arg
        fi
        LAST=""
    esac
done

if [ -n "$ID_FILE" ]; then
    if expr "$ID_FILE" : ".*\.pub" > /dev/null ; then
      ID_FILE="$ID_FILE"
    else
      ID_FILE="$ID_FILE.pub"
    fi
else
    if [ x$SSH_AUTH_SOCK != x ] ; then
     GET_ID="$GET_ID ssh-add -L | grep -vxF 'The agent has no identities.'"
    fi
fi

if [ -z "`eval $GET_ID`" ] && [ -r "${ID_FILE}" ] ; then
  GET_ID="cat ${ID_FILE}"
fi

if [ -z "`eval $GET_ID`" ]; then
  echo "$0: ERROR: No identities found" >&2
  exit 1
fi

if [ "$#" -lt 1 ] || [ "$1" = "-h" ] || [ "$1" = "--help" ] || [ -z "$REMOTE_SERVER" ]; then
  echo "Usage: $0 [-i [identity_file]] [-p port] [user@]machine" >&2
  exit 1
fi

if [ -n "$PORT" ] ; then
PPORT="-p$PORT"
fi

{ eval "$GET_ID" ; } | ssh $REMOTE_SERVER $PPORT "umask 077; test -d .ssh || mkdir .ssh ; cat >> .ssh/authorized_keys" || exit 1


SSH_CMD="ssh $1"
if [ -n "$PORT" ] ; then
SSH_CMD="ssh $1 -p $PORT"
fi

cat <<EOF
Now try logging into the machine with "$SSH_CMD".
EOF