today I want to ask you a question about internet network command
pathping = tracert+ping, so what is the difference between ping and ping in pathping command?
I don't think there is any difference in the ping part of it. When you run pathping, it does a traceroute, then pings each of the devices in the route, and reports the results of ping.
You could do this manually, and I guess at some point someone who had to do that got bored and wrote pathping to do it in a single step.
There is a good discussion of the differences here: http://www.google.com/search?q=pathping+vs+ping