ServiceNow: How to read the content of a text file from an incident record attachment

How to read the content of a text file from an incident record attachment:

 GlideSysAttachment API is used to handle attachments.

With this API,

• we can copy attachment from one record to another
• read the content of a attached file as text, base64 or content stream
• write the content
• read all attachments of a record and also we can delete any of the attachment of a record

var attachment = new GlideSysAttachment();

var incidentSysID = '136e85931bc8fc1037fc4263cc4bcb46';

var agr = attachment.getAttachments('incident', incidentSysID);

gs.info(agr.getRowCount());

while (agr.next()) {

var attachmentContent = attachment.getContent(agr);

gs.info('Attachment content: ' + attachmentContent);

Output:

x_67546_crusher: Attachment content: Vamshi Vemula 
Staff software Engineer