The FrChannels utility reads the first (or only) frame in a frame file and outputs a list of the channels in the file. Here is the usage information (which you get by typing 'FrChannels' without any arguments):
Usage: FrChannels[-a] [-r] [-p] [-s] [-v] This utility lists the channels in a frame file, one per line, followed by the sampling rate in Hz. The frame format supports three different types of channels: ADC (also referred to as raw), processed, and simulated. By default, the output from this utility includes all three types; however, you can restrict the output to a particular type by giving the option -a (or equivalently -r) for raw ADC data, -p for processed data, or -s for simulated data. Options can be combined after one hyphen, e.g. '-ap' to list raw and processed channels. If none of these options is given, then all three types will be included in the output. The -v (verbose) option causes the channel type ('Adc', 'Proc' or 'Sim') to be displayed after the channel name and sampling rate.