netselect:tldr:178d1

The command sudo netselect -vv ${host_1} ${host_2} is used to perform network latency measurements between two hosts (host_1 and host_2) and select the fastest mirror or server.

Here is a breakdown of the command:

• sudo: The sudo command is used to execute the following command with administrative privileges, as it might require access to system resources.

• netselect: It is a network utility tool used to find the fastest mirror/server from a list by measuring and comparing the latency.

• -vv: It stands for "very verbose" and is an option that increases the verbosity level of the command, providing more detailed output.

• ${host_1} and ${host_2}: These are variables representing the hostnames or IP addresses of the two hosts being compared for network latency. The actual values should be provided when executing the command.

By running this command, the netselect tool will measure the round-trip time (RTT) between host_1 and host_2, that is, the time it takes for a packet to be sent from one host to another and returned. It will perform multiple measurements and then select the host with the lowest latency as the fastest mirror or server. The output will contain detailed information about the latency measurements and the selected server.