[martin@martin ~]$ ip addr show
1: lo: <LOOPBACK,UP,LOWER_UP> mtu 65536 qdisc noqueue state UNKNOWN
link/loopback 00:00:00:00:00:00 brd 00:00:00:00:00:00
inet 127.0.0.1/8 scope host lo
valid_lft forever preferred_lft forever
inet6 ::1/128 scope host
valid_lft forever preferred_lft forever
2: enp0s25: <BROADCAST,MULTICAST,UP,LOWER_UP> mtu 1500 qdisc pfifo_fast state UP qlen 1000
link/ether 90:e6:ba:10:df:80 brd ff:ff:ff:ff:ff:ff
inet 10.0.20.11/23 brd 10.0.21.255 scope global enp0s25
valid_lft forever preferred_lft forever
inet6 2001:67c:26f8:1:92e6:baff:fe10:df80/64 scope global dynamic
valid_lft 2592003sec preferred_lft 604803sec
inet6 fe80::92e6:baff:fe10:df80/64 scope link
valid_lft forever preferred_lft forever
3: ppp0: <POINTOPOINT,MULTICAST,NOARP,UP,LOWER_UP> mtu 1492 qdisc pfifo_fast state UNKNOWN qlen 3
link/ppp
inet 193.192.37.28 peer 10.0.128.1/32 scope global ppp0
valid_lft forever preferred_lft forever
[martin@martin ~]$ ip addr show | grep -E -o "[0-9]{1,3}\.[0-9]{1,3}\.[0-9]{1,3}\.[0-9]{1,3}\/[0-9]{1,2}"
127.0.0.1/8
10.0.20.11/23
10.0.128.1/32
[martin@martin ~]$