put your pub key on a remote machine

gistfile1.sh

if [ $# -lt 2 ]; then
    echo "Usage: $0 <key-file> <host> [<user>]"
    return
fi

key="$1"
host="$2"
user="$USER"
if [ $# -eq 3 ]; then
    user=$3
fi

tmp_file=/tmp/temporary-ssh-key
scp $key $user@$host:$tmp_file
ssh -l $user $host "mkdir -p ~/.ssh/; cat $tmp_file >> ~/.ssh/authorized_keys; rm $tmp_file"