modules >
console > stderr
console.stderr read/write property
The console.stderr property gets the current standard console error output file. It's a
File value
console.stderr redirection
Setting the console.stderr property to another File redirects console error output to it : any further call to console.stderr:write() will write output to that File. Closing the console.stderr property closes the current File and reuse the default console error output File.
Example
local console = require "console"
console.stderror:write("Error : internet connection lost")
sys.exit(-1)