And code

Me again, how do I make a double if statement? like

local id, msg = rednet.receive()
if msg == "count" [and rs.getInput("left",true)] then
shell.run("count")
end

how do I code the and section of the if?

if (msg =="count" and rs.getInput("left", true)) then
shell.run("count")
end

The brackets around msg == "count" and rs.getInput("left", true) are optional, but are required if you want more advanced things, like (statement 1 or (statement 2 and statement 3))

You dont need any brackets, you can simply do

if msg == "count" and rs.getInput("left") then -- you dont need the true for getInput, it will return either true or false
shell.run("count")
end