error in running curl as shown in tutorial

[Shubham Gupta]

hey , a beginner here in JIRA api , 
I'm trying to run :

 curl -u username:password https://mycompanyname.atlassian.net/jira/rest/api/2/issue/XYZ-123

 in my mac terminal .

And, i'm getting obviously unexpected result.
what's wrong i'm doing? 

I am just getting the source code of the page.. Do i need to configure my profile or something ? 

[GabrielleJ]

What do you mean by "source of the page"? Whatever you received in the URL you posted should be in json format.

[Jobin Kuruvilla [Adaptavist]]

What error are you getting?