Usage: /usr/bin/gpsrinex [OPTIONS] [server[:port:[device]]]

Mandatory arguments to long options are mandatory for short options too.
     -D, --debug LVL            Set debug level, default 0
     -f FILE, --fileout FILE    Output to filename
                                default: gpsrinexYYYYjjjDHHMM.obs
     -F INFILE, --filein INFILE Read from INFILE, not gpsd
     -g, --gnss                 GNSS to use. Default: CEGIJRS
     -h, --help                 print this usage and exit
     -i SEC, --interval SEC     Time between samples in seconds
                                default: 30.000
     -n COUNT, --count COUNT    Number samples to collect
                                default: 20
     -V, --version              print version and exit

These strings get placed in the generated RINEX 3 obs file
     --agency AGENCY           agency
     --ant_e EASTING           antenna easting in meters
     --ant_h HEIGHT            antenna height in meters
     --ant_n NORTHING          antenna northing in meters
     --ant_num NUM             antenna number
     --ant_type TYPE           antenna type
     --marker_name NAME        marker name
     --marker_type TYPE        marker type
     --observer OBSERVER       observer
     --rec_num NUM             receiver number
     --rec_type TYPE           receiver type
     --rec_vers VERS           receiver vers

defaults to '/usr/bin/gpsrinex -n 20 -i 30.000 localhost:2947'