usage: /usr/bin/fc-validate [-Vhv] [-i index] [-l LANG] [--index index] [--lang LANG] [--verbose] [--version] [--help] font-file...
Validate font files and print result

  -i, --index INDEX    display the INDEX face of each font file only
  -l, --lang=LANG      set LANG instead of current locale
  -v, --verbose        show more detailed information
  -V, --version        display font config version and exit
  -h, --help           display this help and exit