ping6:tldr:91a6b

The command "ping6" is used to send Internet Control Message Protocol version 6 (ICMPv6) Echo Request messages to a target IPv6 address. It checks the network connectivity and measures the round-trip time (RTT) for the packets to reach the destination and come back.

Here is the breakdown of the command:

• "ping6" is the command itself. It is usually available on Unix-like systems (e.g., Linux) for IPv6 network testing.
• "-c" is an option that specifies the count of ICMPv6 Echo Request packets to be sent.
• "${count}" is a placeholder for the desired number of packets to be sent. It should be replaced by an actual value when executing the command. For example, if you want to send 5 packets, you would replace "${count}" with "5".
• "${host}" is another placeholder for the target IPv6 address or hostname you want to ping. It should be replaced by the actual address or hostname. For instance, if you want to ping the IPv6 address "2001:db8::1", you would replace "${host}" with "2001:db8::1".

To execute the command, you need to replace "${count}" and "${host}" with appropriate values and run it in a terminal or command prompt. The output will show information about the packets sent, received, lost, and the round-trip time for each packet.