Different script methods to obtain the primary interface ip address

get_ip_tests.bash

###
### Use any of the following to programmatically obtain the primary interface ip address
###

# using ansible facts module
# requires: jq
ansible -msetup -i localhost, all -o | cut -d'>' -f 2- | jq .ansible_facts.ansible_default_ipv4.address | xargs echo

# ip command and bash
# requires: iproute
(set $(ip addr show dev $(set $(ip route | grep default);echo $5) | grep inet | grep -v inet6);echo $2) | cut -d/ -f 1

# ip command, bash, and read instead of set
# this is more friendly when the output of any
# of the commands are empty
IFS=/ read IP MASK <<< $(read T1 IP T2 <<< $(ip addr show dev $(read T1 T2 T3 T4 DEV T5 <<< $(ip route | grep default) ; echo $DEV) | grep inet | grep -v inet6);echo $IP);echo $IP

# python-ish
# requires: python3.8+
# requires: public network access
# requires: access to google's ip: 8.8.8.8
python3 <<< 'import socket as ss
with ss.socket(ss.AF_INET, ss.SOCK_DGRAM) as s:
    s.connect(("8.8.8.8", 80));print(s.getsockname()[0]);'