create two blank files data.txt and myipaddress.txt so you wont get "files does not exist error " once you have created the two blank files run the script and you should see your ipaddress in the file myipaddress.txt. cat myipaddress.txt simple and effective

rm data.txt; rm myipaddress.txt; /sbin/ifconfig | grep "Bcast" >> data.txt ; cut -c21-35 data.txt >> myipaddress.txt

You could also do it this way,

ifconfig | grep 'inet addr' | cut -d":" -f2 | cut -d" " -f1 > ipaddress.txt