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readlineとfsはrequireするだけで使える.

test.js

test.js
var file_path = "test.txt"
var rl = require('readline').createInterface({
  input: require('fs').createReadStream( file_path ),
  terminal: false
}).on("line", function(line){
  console.log( "line: " + line )
}).on("close", function(){
  console.log( "Finished file seek" )
})

console.log("Done")

test.txt

test.txt
a
b
c
d
e
f
% node test.js
Done
line: a
line: b
line: c
line: d
line: e
line: f
Finished file seek