Simple shell script to get your machine's current local IP.

current-local-ip

# type this in a terminal window to get your current local ip address:
ifconfig | grep 192 | awk '{print $2}'
 
# add this to whatever file runs when you open a new shell
# (~/.profile on OS X)
alias ip="ifconfig | grep 192 | awk '{print \$2}'"
 
# now you can type "ip" in a terminal window to get your local ip.
# note: you can replace "ip" with whatever you want.

I recommend:

ifconfig | grep "inet " | grep -v "127.0.0.1" | awk '{ print $2 }'

... as you might not be on a 192.x subnet.