fc-cache --version (return code: 0)
fontconfig version 2.11.94
fc-cache --help (return code: 0)
usage: fc-cache [-EfrsvVh] [-y SYSROOT] [--error-on-no-fonts] [--force|--really-force] [--sysroot=SYSROOT] [--system-only] [--verbose] [--version] [--help] [dirs]
Build font information caches in [dirs]
(all directories in font configuration by default).
-E, --error-on-no-fonts raise an error if no fonts in a directory
-f, --force scan directories with apparently valid caches
-r, --really-force erase all existing caches, then rescan
-s, --system-only scan system-wide directories only
-y, --sysroot=SYSROOT prepend SYSROOT to all paths for scanning
-v, --verbose display status information while busy
-V, --version display font config version and exit
-h, --help display this help and exit