how to enter command-prompt of tfactl

I cannot enter command-line for tfactl, anyone had this problem before? I have single-node RAC 11.2.0.4 on Linux 6.7

I ran as root user

[root@box1~]# /u01/app/11.2.0/grid/tfa/bin/tfactl

instead of entering command-line prompt I get below message:

Usage : /u01/app/11.2.0/grid/tfa/bin/tfactl <command> [options]

<command> =

         print        Print requested details

         purge        Delete collections from TFA repository

         directory    Add or Remove or Modify directory in TFA

         host         Add or Remove host in TFA

         set          Turn ON/OFF or Modify various TFA features

         diagcollect  Collect logs from across nodes in cluster

For help with a command: /u01/app/11.2.0/grid/tfa/bin/tfactl <command> -help