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var grAttachment = new GlideRecord('sys_attachment'); //the table where attachment metadata is stored
grAttachment.get('0003ea666f015600623008efae3ee4f7'); //sys_id of a record in the sys_attachment table
var md5HashSum = calculateMD5Hash(grAttachment);

function calculateMD5Hash(attachmentGR) {
	var attachmentInputStream = GlideSysAttachmentInputStream(attachmentGR.sys_id + '');
	var chksum = (new GlideChecksum()).calculateMD5CheckSum(attachmentInputStream);
	gs.print(chksum);
}

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var recordTable = 'incident';
var idOfRecord = '755d52b137b0b30090b68cf6c3990e6f';
var grAttachment = getAttachmentRecord(recordTable, idOfRecord, 'example text doc.txt', true);
if (grAttachment !== false) {
	var attachmentStream = new GlideSysAttachment().getContentStream(
		grAttachment.getValue('sys_id')
	);
	var gDigest = new GlideDigest();
	var base64MD5 = gDigest.getMD5Base64FromInputStream(attachmentStream); //Scope only
	gs.info(base64MD5);

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var tableName = 'incident';
var sysIDOfRecord = '755d52b137b0b30090b68cf6c3990e6f';
var fileNameSansExtension = 'example text doc'; //Full file name: example text doc.txt

var grRecordWithAttachment = new GlideRecord(tableName);
grRecordWithAttachment.get(sysIDOfRecord);

var gsa = new GlideSysAttachment();
//ONLY works in global
var textVal = gsa.get(grRecordWithAttachment, fileNameSansExtension); 

thisnameissoclever

var recordTable = 'incident';
var idOfRecord = '755d52b137b0b30090b68cf6c3990e6f';
var grAttachment = getAttachmentRecord(recordTable, idOfRecord, 'example text doc.txt', true);
var gsaTextFile = new GlideSysAttachment();
var strContents = gsaTextFile.getContent(grAttachment); //ONLY worked in non-global scope

gs.info(strContents);


/**

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var tableName = 'incident';
var recordID = '755d52b137b0b30090b68cf6c3990e6f';
gs.print(getAttachmentContentsAsString(tableName, recordID));

function getAttachmentContentsAsString(tableName, recordID) {
	//Declare a new instance of GlideSysAttachment.
	var gsa = new GlideSysAttachment();
	//Get the raw bytes in the file
	var bytesInFile = gsa.getBytes(tableName, recordID);
	//Convert that jive into a string using Java/Rhino.

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/**
 * Does the work on each loop.
 * @param {Number} [limit=10] - The number of records to process per loop.
 * @param {Number} [currentNumber=0] - The number of records that have been processed so far, by all previous loops.
 */
function eventWrapper(limit, currentNumber) {
	
	var EVENT_NAME = 'EVENT.NAME.HERE'; //todo: Update this to the name of the event you've created.
	var TABLE_NAME = 'TABLE_NAME_HERE'; //todo: Update this to the name of the table containing the records you're processing
	var QUERY = 'some_query=here'; //todo: Put your query here

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var DynamicRefQuals= Class.create();
DynamicRefQuals.prototype = Object.extendsObject(AbstractAjaxProcessor, {

	//Client-callable
	/*
		To quickly and easily create a dynamic reference qualifier script, simply add a custom method to this Script Include.
		Here are the guidelines for modifying this Script Include:
		1. In the "@author" JSDoc tag of the method your implement, please put your user ID (For example: "twoodruff").
		2. See how the getGroupMembersByID and getGroupMembersByName methods are documented, and try to document your method in the same fashion.
		3. Unless you've got permission from the author, please do not modify anyone else's methods.

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/***CLASSES***/
class APIClass {
	/**
	 * An APIClass object
	 * @param name {string} The name of the API class
	 */
	constructor(name, classDesc = '') {
		this._className = name;
		this._classDescription = classDesc;
		/**

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/*
	Script Include definition:
		Name: JournalRedactor
		Client Callable: false
		Accessible from: All application scopes
	Additional details: 
		Version: 1.3
		Usage documentation: http://redactor.snc.guru/
		License: https://gist.github.com/thisnameissoclever/767b8a738b929a0bd943965431061c1e
*/

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https://snprotips.com/blog/2018/3/15/service-catalog-try-in-portal-button