myip4

# This script lists the ip addresses you are currently using.
# If I were super-elitist, I could just say the code below is the 
# documentation.  That's not me.  The piping sequence is long and scary.
#
# 1) query ip addr for info on local networking
# 2) only get the lines containing inet
# 3) exclude the line that has the local loopback
# 4) get rid of leading white space
# 5) discard the broadcast address
# 6) discard the netmask
# 7) print only the fifth and second fields, in that order
#
# This script also accepts one switch of either:
#   -a   List all (internal and public) IP addresses
#   -i   List only internal IP addresses
#   -p   List only public IP address

switch="$1" && [[ "$switch" == "" ]] && switch='-a'

if [ $switch == -i -o $switch == -a ]; then
  ip addr  | grep 'inet ' | grep -v 'host lo' | sed 's/ *inet/inet/g' | 
  sed 's/brd [0-9]*\.[0-9]*\.[0-9]*.[0-9]* //g' | sed 's/\/[0-9]*//g' | 
  awk '{print$5,$2}'
fi

if [ $switch == -p -o $switch == -a ]; then
  echo "public `curl ifconfig.me 2> /dev/null`"
fi