how to create attachment excel record in servicenow using script

[AnimeshP_96]

hello, 

Urgent help need

I have a updated excel that i want to attach to attachment record using script because kb article is published.

var attachment = new GlideSysAttachment();

//set up inputs
var rec = new GlideRecord('kb_knowledge');
rec.get('sys_id');
var fileName = 'abc.xls';
var contentType = 'application/vnd.ms-excel';
var content = '';

var agr = attachment.write(rec, fileName, contentType,content);

gs.info('The attachment sys_id is: ' + agr);

[Sid_Takali]

var attachment = new GlideSysAttachment();
var rec = new GlideRecord('kb_knowledge');
rec.get('sys_id_of_the_kb_article'); 
var fileName = 'abc.xls';
var contentType = 'application/vnd.ms-excel';
var content = ''; 
var attachmentSysId = attachment.write(rec, fileName, contentType, content);
gs.info('The attachment sys_id is: ' + attachmentSysId);

[AnimeshP_96]

?
i think you copy pasted my code, this is not working.!!
this code is already tried by me