4. Using screen as a serial console

   Using screen you can connect to any serial device in /dev. A typical USB-to-RS-232 adapter will usually be /dev/ttyUSB0. A physical serial port will usually be /dev/ttyS0.

   screen /dev/ttyUSB0 9600
   

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5. Discover IPv6 Neighbors

   Ping nodes on the local network segment using multicast [1]

   ping6 -c2 -I <interface> ff02::1
   

   Then, view IPv6 neighbors

   ip -f inet6 neigh
   

   References

   [1]	https://en.wikipedia.org/wiki/Multicast_address

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6. Renew Expired GPG Keys

   Renew an expired GPG key by extending the expiration date.

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7. Set time with NTPd

   Start NTP daemon and set the time regardless of what the current offset is.

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8. Show all iptables rules and include line numbers

   iptables -L INPUT --line-numbers
   

   Replace iptables rule at a specific line number

   iptables -R X INPUT <new rule here>
   

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