How do i check if stdin exists?

[coolian 0]

how do i check that stdin exists?

at the moment i try to do it like so

if io.stdin ~= nil then
	-- read stdin
end

however i get the error "attempt to index a nil value (field 'stdin')"

how is this even possible if im checking if it is nil?

i am using this in an attempt to recreate the 'tee' tool from linux

[Molinko 43]

I'd bet that the io object is just a table and there's some metamethod stuff going on. So, testing for the field 'stdin' is actually nil. Maybe try simply 'io.read' or 'term.read' and testing the return value(s)