/usr/bin/mariadb-conv: unknown option '--help'
/usr/bin/mariadb-conv from 12.3.3-MariaDB, client 1.0 for Linux (x86_64)
Character set conversion utility for MariaDB
Usage:
/usr/bin/mariadb-conv [OPTION...] [FILE...]
  -f, --from=name     Specifies the encoding of the input.
  -t, --to=name       Specifies the encoding of the output.
  -c, --continue      Silently ignore conversion errors.
  --delimiter=name    Treat the specified characters as delimiters.
  --character-sets-dir=name
                      Directory for character set files.