SuiteScript - Open, Read File - file

Question

This is going to be a really stupid question - how do I open a file in the Filing Cabinet and read it in, line by line, using SuiteScript? Every example I can find online seems to start in the middle, taking for granted knowledge that I don't possess.
Is there a simple example somewhere online I've not found? All I need is for it to:
Open file (giving file name and folder)
Read the first line
Read the second line
....
Close the file.

Answer 1

In Suitescript 2.0 use the N/file module. The module can only be used in server side (not client) scripts. Reference Suite Answer Id: 43524 for N/file module and Suite Answer Id: 43520 for Script Types.
require(['N/file', 'N/record'], function(file, record) {
//use file name and folder and 'N/search' module to find the file id if necessary
// load file
var myFile = file.load({
id: '__' //enter the file internal id, absolute or relative file path
})
//get the # of lines
var arrLines = myFile.getContents().split(/\n|\n\r/);
// loop through each line, skipping the header
for (var i = 1; i < arrLines.length - 1; i++) {
//split the 1 line of data into an array. If the file was a csv file, each array position holds a value from the columns of the 1 line of data
var content = arrLines[i].split(',');
// get values from the columns of a CSV file
var column1 = content[0]; //first column
var column2 = content[1]; //second column
//can use the column data above to i.e. create new record and set default value, update existing records, write the data elsewhere
//to check each line for a given value
arrLines[i].includes('keyword'); //returns true or false
}
});

Answer 2

You can get the suitescript api documentation here
https://docs.oracle.com/cloud/latest/netsuitecs_gs/docs.htm
look at the file module

Answer 3

Let's keep it simple:
For SuiteScript 1.0:
var arrLines = nlapiLoadFile({fileinternalid}).getValue().split(/\n|\n\r/);
For SuiteScipt 2.0:
var arrLines = file.load({
id: {fileinternalid}
});
arrLines.getValue().split(/\n|\n\r/);
arrLines.description = 'My CSV File'
var fileId = arrLines.save();
...
// Add additional code