ssh with ssh-add

ssh()
{
    if [ -z "$SSH_AUTH_SOCK" ]
    then
        eval `/usr/bin/ssh-agent`
    elif [ "$SSH_AUTH_SOCK" != "`echo /tmp/ssh-*/agent.*`" ]
    then
        export SSH_AUTH_SOCK=`echo /tmp/ssh-*/agent.*`
    fi
    
    if [ `ssh-add -l > /dev/null 2>&1 ; echo $?` -eq 1 ]
    then
        echo "ssh-agent has no identities"
        ssh-add -t 12h ${SSH_PRVKEY} && echo ""
    fi
    
    if [ "$?" -eq 0 ]
    then
        /usr/bin/ssh ${@}
    fi
}