自动ssh

#!/bin/bash
################################
# The:    CaiJiangFeng.
# From:    Baustem.
# Date:    2012-12-26
#################################

usage ()
{
  echo '##################'
  echo "usage:    $0 ''";
  echo '##################'
}

ping_host ()
{
ping_count=3
echo ""
echo "chk host ping..."
ping -c${ping_count} $1 >/dev/null;
};

#bigen

r_host=$1

if [ $# -ne 1 ];then
    usage;
    exit 1
fi

#chk ping
ping_host r_host;

if [ $? -ne 0 ];then
    echo "r_host timed out..."
    echo
    exit 2
else
    echo ping OK.
fi

if ! [ -f ~/.ssh/id_rsa.pub ];then
    echo '####################'
    echo "pl input :"
    echo '####################'
     ssh-keygen -t rsa
fi

cat ~/.ssh/id_rsa.pub |ssh $r_host "cat >> ~/.ssh/authorized_keys" >/dev/null

if [ $? -eq 0 ];then
    sleep 1
    echo '###################'
    echo create autossh done.
    echo '###################'
else
    echo "chk $r_host prot 22 ."
fi