/usr/lib/ruby/gems/3.2.0/gems/io-event-1.7.1/lib/io/event/support.rb:36: warning: IO::Buffer is experimental and both the Ruby and C interface may change in the future!
Usage: fluent-binlog-reader <command> [<args>]

Commands of fluent-binlog-reader:
   cat     :     Read files sequentially, writing them to standard output.
   head    :     Display the beginning of a text file.
   formats :     Display plugins that you can use.

See 'fluent-binlog-reader <command> --help' for more information on a specific command.
Error: '--help' is not supported: Required subcommand : cat | head | formats