Example D.2. Help information available from capinfos

$ capinfos -h
Capinfos 1.1.4
Prints information about capture files.
See https://www.wireshark.org for more information.

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

General:
  -t display the capture file type
  -E display the capture file encapsulation

Size:
  -c display the number of packets
  -s display the size of the file (in bytes)
  -d display the total length of all packets (in bytes)

Time:
  -u display the capture duration (in seconds)
  -a display the capture start time
  -e display the capture end time

Statistic:
  -y display average data rate (in bytes/sec)
  -i display average data rate (in bits/sec)
  -z display average packet size (in bytes)
  -x display average packet rate (in packets/sec)

Miscellaneous:
  -h display this help and exit

If no options are given the default is to display all infos