list Kerberos credentials

-f      Include ticket flags in short form, each character stands for a specific flag, as follows:
              F    forwardable
              f    forwarded
              P    proxiable
              p    proxied
              D    postdate-able
              d    postdated
              R    renewable
              I    initial
              i    invalid
              A    pre-authenticated
              H    hardware authenticated

        This information is also output with the --verbose option, but in a more verbose way.