[IPv4 Addresses] Prints IPv4 addresses of the host #Shell

net_ip4.sh

# net_ip4.sh

( # linux (NetworkManager)
  nmcli -terse -mode tabular -fields IP4.ADDRESS device show ||
  
  # linux (iproute2)
  ip -family inet -brief address |

  # linux/bsd
  ( ip address || ifconfig ) | 
  	grep "inet " | 
    sed 's/cast.*//g'

) 2>/dev/null |
    grep --only-matching --extended-regexp --regexp="([0-9]{1,3}\.){3}[0-9]{1,3}" | 
    grep --invert-match "^127" ||

exit 1 #failure

exit 0 #success