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## For shell only:
Using your text editor once again, edit /boot/boot.rc (this assumes you have already renamed this file to boot.rc If not, see RPi_Advanced_Setup). For example:

sudo vi /boot/boot.rc
Add the following at the end of the file, making changes to the path for your directory tree and save.

python /home/pi/Code/RPi_IP_emailer.py


## For Rasbian:
sudo vi /etc/rc.local

 # rc.local
 #
 # This script is executed at the end of each multiuser runlevel.
 # Make sure that the script will "exit 0" on success or any other
 # value on error.
 #
 # In order to enable or disable this script just change the execution
 # bits.
 #
 # By default this script does nothing.
 # Print the IP address if it doesn't work ad sleep 30 before all your code 
 sleep = 10      <<<------------------------------------------ ADD THIS LINE IF DOESN'T WORK IMMEDIATELY!!!
 _IP=$(hostname -I) || true
 if [ "$_IP" ]; then
   printf "My IP address is %s\n" "$_IP"
   python /home/pi/Code/RPi_IP_emailer.py        <<<------------------------------------------ ADD THIS LINE!!!
 fi
 exit 0

RPi_IP_emailer.py

__author__ = 'Cody Giles'
__license__ = "Creative Commons Attribution-ShareAlike 3.0 Unported License"
__version__ = "1.0"
__maintainer__ = "Cody Giles"
__status__ = "Production"

import subprocess
import smtplib
from email.mime.text import MIMEText
import datetime

def connect_type(word_list):
    """ This function takes a list of words, then, depeding which key word, returns the corresponding
    internet connection type as a string. ie) 'ethernet'.
    """
    if 'wlan0' in word_list or 'wlan1' in word_list:
        con_type = 'wifi'
    elif 'eth0' in word_list:
        con_type = 'ethernet'
    else:
        con_type = 'current'

    return con_type

# Change to your own account information
# Account Information
to = '[email protected]' # Email to send to.
gmail_user = '[email protected]' # Email to send from. (MUST BE GMAIL)
gmail_password = 'gmailpassword' # Gmail password.
smtpserver = smtplib.SMTP('smtp.gmail.com', 587) # Server to use.

smtpserver.ehlo()  # Says 'hello' to the server
smtpserver.starttls()  # Start TLS encryption
smtpserver.ehlo()
smtpserver.login(gmail_user, gmail_password)  # Log in to server
today = datetime.date.today()  # Get current time/date

arg='ip route list'  # Linux command to retrieve ip addresses.
# Runs 'arg' in a 'hidden terminal'.
p=subprocess.Popen(arg,shell=True,stdout=subprocess.PIPE)
data = p.communicate()  # Get data from 'p terminal'.

# Split IP text block into three, and divide the two containing IPs into words.
ip_lines = data[0].splitlines()
split_line_a = ip_lines[0].split()
split_line_b = ip_lines[1].split()

# con_type variables for the message text. ex) 'ethernet', 'wifi', etc.
ip_type_a = connect_type(split_line_a)
ip_type_b = connect_type(split_line_b)

"""Because the text 'src' is always followed by an ip address,
we can use the 'index' function to find 'src' and add one to
get the index position of our ip.
"""
ipaddr_a = split_line_a[split_line_a.index('src')+1]
ipaddr_b = split_line_b[split_line_b.index('src')+1]

# Creates a sentence for each ip address.
my_ip_a = 'Your %s ip is %s' % (ip_type_a, ipaddr_a)
my_ip_b = 'Your %s ip is %s' % (ip_type_b, ipaddr_b)

# Creates the text, subject, 'from', and 'to' of the message.
msg = MIMEText(my_ip_a + "\n" + my_ip_b)
msg['Subject'] = 'IPs For RaspberryPi on %s' % today.strftime('%b %d %Y')
msg['From'] = gmail_user
msg['To'] = to
# Sends the message
smtpserver.sendmail(gmail_user, [to], msg.as_string())
# Closes the smtp server.
smtpserver.quit()