Get ip username login root shell script

vi  /root/.bashrc



# which mail addres to send?
email='xxx@xxx.com.tw,root_check@xxx.com.tw'

#get user information
ipaddr=`who am i | awk '{print $6}' | cut -d '(' -f2 | cut -d ')' -f1`
tty=`who am i | awk '{print $2}'`
username=`ps aux | grep "$tty" | grep sshd | awk '{print $12}' | head -n1 | cut -d '@' -f1`

#check macaddr
ping "$ipaddr" -c1 &> /dev/null
macaddr=`arp -a $ipaddr | awk '{print $4}'`

#input from whitch interface
interface=`arp -a $ipaddr | awk '{print $7}'`

#check if can't receive macadr
if [ "$macaddr" == 'entries' ]; then
        macaddr="can't find macaddr in arp"
fi

if [ "$interface" == 'found.' ]; then
        interface="can't find interface in arp"
fi

#send mail now
echo -e "
  Somebody changing identity to [ root ] on `hostname`!! \n
  username:       $username \r
  ipaddr:         $ipaddr \r
  macaddr:        $macaddr \r
  interface:      $interface \r
  console:        $tty \r
  date:           `date` \n" | mail -s "Somebody changing identity to SUPERUSER on `hostname`!!" $email
shopt -s histappend
PROMPT_COMMAND="history -a; $PROMPT_COMMAND"