Module io 

The input and output library.

I/O operations come in two styles. The simple style uses implicit default files: io.read and io.write operate on the current input and output files, set with input and output. The complete style uses explicit file handles returned by open, with the operations available as methods:

local f = assert(io.open("notes.txt", "r"))
for line in f:lines() do
  print(line)
end
f:close()

The library also provides three predefined handles: stdin, stdout and stderr.

Structs

file

A handle to an open file.

Statics

stderr

The standard error file handle.

stdin

The standard input file handle.

stdout

The standard output file handle.

Functions

close

Closes a file, or the default output file.

flush

Flushes the default output file.

input

Sets or gets the default input file.

lines

Iterates over the lines of a named file.

open

Opens a file.

output

Sets or gets the default output file.

popen

Starts a program and connects to it with a pipe.

read

Reads from the default input file.

tmpfile

Returns a handle for a temporary file.

type

Checks whether a value is a file handle.

write

Writes to the default output file.