captype can print capture file type information about capture files. For more information on captype consult your local manual page (man captype) or the online version.

Help information available from captype. 

Captype (Wireshark) 4.5.0 (v4.5.0rc0-2330-g03777e997fd4)
Print the file types of capture files.
See https://www.wireshark.org for more information.

Usage: captype [options] <infile> ...

Miscellaneous:
  -h, --help               display this help and exit
  -v, --version            display version info and exit