io.lines ([filename])

Opens the given file name in read mode and returns an iterator function that, each time it is called, returns a new line from the file. Therefore, the construction

     for line in io.lines(filename) do body end

will iterate over all lines of the file. When the iterator function detects the end of file, it returns nil (to finish the loop) and automatically closes the file.

The call io.lines() (with no file name) is equivalent to io.input():lines(); that is, it iterates over the lines of the default input file. In this case it does not close the file when the loop ends.

EVERYTHING
Input and Output Facilities
file:close
file:flush
file:lines
file:read
file:seek
file:setvbuf
file:write
io.close
io.flush
io.input
io.lines
io.open
io.output
io.popen
io.read
io.tmpfile
io.type
io.write

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