oci-curl is a bash function provided in the documentation that makes it easy to get started with the REST APIs. You will need to complete a few setup operations before you can start calling it.
Start by copying the function code from the documentation into a shell script on your machine. I saved it into a file named oci-curl.sh, for example.
You will see the following section at the top of the file. You need to replace these four values with your own.
TODO: update these values to your own
local tenancyId= "ocid1.tenancy.oc1..aaaaaaaaba3pv6wjqae5f15p2b2m2yt2j6rx32uzr4h25vqstifsfdsq";
local authUserId= "ocid1.user.oc1..aaaaaaaatvwc5j6aqzjcaty5eqbb6qt2jvpkanghtgdaqedqw3rynjq";