ifconfig |  awk 'NR < 9 { print }'
docker0: flags=4163<UP,BROADCAST,RUNNING,MULTICAST>  mtu 1500
        inet 172.17.0.1  netmask 255.255.0.0  broadcast 172.17.255.255
        inet6 fe80::42:f4ff:fe45:f84b  prefixlen 64  scopeid 0x20<link>
        ether 02:42:f4:45:f8:4b  txqueuelen 0  (Ethernet)
        RX packets 970  bytes 5650883 (5.3 MiB)
        RX errors 0  dropped 0  overruns 0  frame 0
        TX packets 68782  bytes 9697158 (9.2 MiB)
        TX errors 0  dropped 0 overruns 0  carrier 0  collisions 0
dan@raspberrypi:~ $ ifconfig |  awk '/inet/ { print }'
        inet 172.17.0.1  netmask 255.255.0.0  broadcast 172.17.255.255
        inet6 fe80::42:f4ff:fe45:f84b  prefixlen 64  scopeid 0x20<link>
        inet 192.168.1.71  netmask 255.255.255.0  broadcast 192.168.1.255
        inet6 fe80::2725:88ef:1182:9505  prefixlen 64  scopeid 0x20<link>
        inet 127.0.0.1  netmask 255.0.0.0
        inet6 ::1  prefixlen 128  scopeid 0x10<host>
        inet 169.254.221.34  netmask 255.255.0.0  broadcast 169.254.255.255
        inet6 fe80::f01b:280b:c72:dee6  prefixlen 64  scopeid 0x20<link>
dan@raspberrypi:~ $ ifconfig |  awk '/eth0/inet/ { print }'
awk: línea ord.:1: /eth0/inet/ { print }
awk: línea ord.:1:             ^ syntax error
dan@raspberrypi:~ $ ifconfig |  awk '"/eth0"//inet/ { print }'
awk: línea ord.:1: (FILENAME=- FNR=1) fatal: se intentó una división por cero
dan@raspberrypi:~ $ ifconfig |  awk '"/eth0/"/inet/ { print }'
awk: línea ord.:1: "/eth0/"/inet/ { print }
awk: línea ord.:1:                ^ syntax error
dan@raspberrypi:~ $ ifconfig |  awk '/inet/ { print }'
        inet 172.17.0.1  netmask 255.255.0.0  broadcast 172.17.255.255
        inet6 fe80::42:f4ff:fe45:f84b  prefixlen 64  scopeid 0x20<link>
        inet 192.168.1.71  netmask 255.255.255.0  broadcast 192.168.1.255
        inet6 fe80::2725:88ef:1182:9505  prefixlen 64  scopeid 0x20<link>
        inet 127.0.0.1  netmask 255.0.0.0
        inet6 ::1  prefixlen 128  scopeid 0x10<host>
        inet 169.254.221.34  netmask 255.255.0.0  broadcast 169.254.255.255
        inet6 fe80::f01b:280b:c72:dee6  prefixlen 64  scopeid 0x20<link>
dan@raspberrypi:~ $ ifconfig |  awk '/inet/ { print }' | awk '! /inet6/ { print }
> ^C
dan@raspberrypi:~ $ ifconfig |  awk '/inet/ { print }' | awk '! /inet6/ { print }'
        inet 172.17.0.1  netmask 255.255.0.0  broadcast 172.17.255.255
        inet 192.168.1.71  netmask 255.255.255.0  broadcast 192.168.1.255
        inet 127.0.0.1  netmask 255.0.0.0
        inet 169.254.221.34  netmask 255.255.0.0  broadcast 169.254.255.255
dan@raspberrypi:~ $ ifconfig |  awk '/inet 172.*/ { print }' | awk '! /inet6/ { print }'
        inet 172.17.0.1  netmask 255.255.0.0  broadcast 172.17.255.255
dan@raspberrypi:~ $ ifconfig |  awk '/inet/ { print }' | awk '! /inet6/ { print }'
        inet 172.17.0.1  netmask 255.255.0.0  broadcast 172.17.255.255
        inet 192.168.1.71  netmask 255.255.255.0  broadcast 192.168.1.255
        inet 127.0.0.1  netmask 255.0.0.0
        inet 169.254.221.34  netmask 255.255.0.0  broadcast 169.254.255.255
dan@raspberrypi:~ $ ifconfig |  awk '/inet/ { print }' | awk '! /inet6/ { print }'| awk '! /172.*/ { print }
> ^C
dan@raspberrypi:~ $ ifconfig |  awk '/inet/ { print }' | awk '! /inet6/ { print }'| awk '! /172.*/ { print }'
        inet 192.168.1.71  netmask 255.255.255.0  broadcast 192.168.1.255
        inet 127.0.0.1  netmask 255.0.0.0
        inet 169.254.221.34  netmask 255.255.0.0  broadcast 169.254.255.255