switchblade commands question

[sc0rpi0]

I was curious concerning two common switchblade commands.

What does the ">nul" do in this command:

if not exist ....Documentslogfiles md ....Documentslogfiles >nul

What does the"2>&1" do in the command:

ipconfig /all >> ....Documentslogfiles%computername%.log 2>&1

Thanks very much.

[ryanlash]

as far "> nul" that hides the output of a command, some commands do not respond to @echo off