Jump to content
  • Sky
  • Blueberry
  • Slate
  • Blackcurrant
  • Watermelon
  • Strawberry
  • Orange
  • Banana
  • Apple
  • Emerald
  • Chocolate
  • Charcoal
  • 0

How do i check if stdin exists?


how do i check that stdin exists?

at the moment i try to do it like so

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

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

Link to post
Share on other sites

1 answer to this question

Recommended Posts

  • 1

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)

Link to post
Share on other sites

Join the conversation

You can post now and register later. If you have an account, sign in now to post with your account.
Note: Your post will require moderator approval before it will be visible.

Answer this question...

×   Pasted as rich text.   Paste as plain text instead

  Only 75 emoji are allowed.

×   Your link has been automatically embedded.   Display as a link instead

×   Your previous content has been restored.   Clear editor

×   You cannot paste images directly. Upload or insert images from URL.


  • Create New...

Important Information

By using this site, you agree to our Terms of Use and Privacy Policy.