This scipt lists all cf org id's with the corresponding org names.

orgs.sh

#!/bin/bash
# list all org guids

# list of all Org names we need to iterate through
orgs=$(cf orgs | tail -n +4)

function get_guid() {
  org=$1
  echo "$org:"
  # get org GUID
  cf org "$org" --guid
  echo ""
}

for org in $orgs
do
  get_guid $org
done