N/file Module
file.Reader
Object Description: Use for special read operations. Reads from a file until a specified delimiter is reached. Reads an arbitrary number of characters from a file.
Supported Script Types: Server-side scripts For more information, see SuiteScript 2.0 Script Types.
Module: N/file Module
Methods and Properties: Reader Object Members
Since: 2019.1
Search NetSuite - https://system.netsuite.com/app/help/helpcenter.nl?search=file.Reader

// Code Example 1

var reader = context.input.file.getReader();



    var textUntilFirstComma = reader.readUntil(',');

    var next10Characters = reader.readChars(10);

    var textUntilNextNewLine = reader.readUntil('\n');

    var next100Characters = reader.readChars(100);



//SOURCE: https://system.netsuite.com/app/help/helpcenter.nl?fid=section_1543844186.html