Re: what is my IP?

[Douglas Ward <dwdraw@bellsouth.net>]

On Sat, 2005-01-29 at 16:35 +0100, gerhard wrote:
> Am Samstag 29 Januar 2005 15:31 schrieb Gerhard Gaußling:
> > $  su --command="ifconfig |egrep -A1  Point-to-Point|egrep '(inet
> > addr:)'| sed -n '1p'"|gawk '{print  $2}'|cut -c6-22
> better You use this script, it doesn't need root access:
> #/usr/local/bin/myip 
> #!/bin/bash
> echo "Current IP is:"
> /sbin/ifconfig |egrep -A1  Point-to-Point|egrep '(inet addr:)'|  \
> sed -n '1p'|gawk '{print  $2}'|cut -c6-22
> 
> Kind regards
> 
> Gerhard Gaußling
> 

Another one-liner using ifconfig (where ethx is your external network
interface):
$ /sbin/ifconfig ethx | grep inet | awk '{print $2}' | awk  -F : '{print
$2}'


Here is an OVERKILL script for checking your IP address--there are many
ways to check your IP address
(requires package curl):

#!/bin/bash
# Script to upload encrypted IP address to web page.
# Created by Douglas Ward
# 2004-July-07
# 2004-November-13 - if checkip.dyndns.org returns nothing, retry 6
times
#
# Capture IP from IFACE -> ip
# Check for new address.  If not new, exit script.
# If new, continue and log new address.
# uses checkip.dyndns.org AND curl
# retry checkip 6 times, if needed, fail without writing to log
# backup to checking ifconfig
# edited for debian-user 2005 Jan 30
#

# Use ifconfig; use in case of web check failure? YES or NO
IFCFG="YES"
IFCFG_BAK="YES"

# Use web check in case mysteriously ifconfig fails? YES or NO
DYN_BAK="YES"
IFACE="eth0"

# [writable] Directory to hold logs
DIR=.

PATH=${DIR}/:/bin:/sbin:/usr/bin

if [ ! -r ${DIR}/ip ]; then
    touch ${DIR}/ip
    echo 0 > ${DIR}/ip
fi

if [ ! -r ${DIR}/log ]; then
    touch ${DIR}/log
fi

IPOLD=$(cat ${DIR}/ip)

if [ $IFCFG = "YES" ]; then
    IPNEW=$(/sbin/ifconfig $IFACE | grep inet | awk '{print $2}' | awk
-F : '{print $2}')
    echo $IPNEW
    while [ ! $IPNEW ]; do
        sleep 90
        IPNEW=$(/sbin/ifconfig $IFACE | grep inet | awk '{print $2}' |
awk  -F : '{print$2}')
        if [ $DYN_BAK = "YES" ]; then
            if [ ! $IPNEW ]; then
                IPNEW=$(curl http://checkip.dyndns.org/ 2>/dev/null |
grep "Current" | aw//')print $6}' | sed 's/<\/body><\/html>//' | sed 's/
            fi
        fi
        COUNT=$COUNT+1

        if [ $COUNT = 6 ]; then
            exit
        fi

    done

fi

if [ $IFCFG = "NO" ]; then
    IPNEW=$(curl http://checkip.dyndns.org/ 2>/dev/null | grep "Current"
| awk '{print $6//') sed 's/<\/body><\/html>//' | sed 's/
    echo $IPNEW
    while [ ! $IPNEW ]; do
        sleep 90
        IPNEW=$(curl http://checkip.dyndns.org/ 2>/dev/null | grep
"Current" | awk '{prin//')}' | sed 's/<\/body><\/html>//' | sed 's/
        if [ $IFCFG_BAK = "YES" ]; then
            if [ ! $IPNEW ]; then
            IPNEW=$(/sbin/ifconfig $IFACE | grep inet | awk '{print $2}'
| awk  -F : '{print $2}')
            fi
        fi
        COUNT=$COUNT+1

        if [ $COUNT = 6 ]; then
            exit
        fi

    done

fi

echo "Current IP Address:"
echo $IPNEW

if [ $IPOLD = $IPNEW ]; then
    exit
fi

rm ${DIR}/ip*

# Logging information in this string

IPLOG=$(echo $(date) $IPNEW)

echo IP Address change

echo $IPNEW > ${DIR}/ip
echo $IPLOG >> ${DIR}log


# mail logging string to root
echo -e New Address:\\n$IPLOG\\n\\nAddress Log:\\n$(cat /etc/postip/log)
| mail root -s"router IP ADDRESS CHANGE"

# END OF SCRIPT