$ gitlab-subdomains -h

Usage of gitlab-subdomains:
  -d string
    	domain you are looking for (required)
  -debug
    	debug mode
  -e	extended mode, also look for <dummy>example.<tld>
  -t string
    	gitlab token (required), can be:
    	  • a single token
    	  • a list of tokens separated by comma
    	  • a file (.tokens) containing 1 token per line
    	if the options is not provided, the environment variable GITLAB_TOKEN is readed, it can be:
    	  • a single token
    	  • a list of tokens separated by comma