Usage: /usr/bin/gdallocationinfo [--help] [--long-usage] [--help-general]
                                 [-xml] [-lifonly] [-valonly] [-E]
                                 [-field_sep <sep>] [-ignore_extra_input]
                                 [-b <band>]... [-overview <overview_level>]
                                 [-r nearest|bilinear|cubic|cubicspline]
                                 [[-l_srs <srs_def>]|[-geoloc]|[-wgs84]]
                                 [-oo <NAME>=<VALUE>]...
                                 <srcfile> <x> <y>

Note: /usr/bin/gdallocationinfo --long-usage for full help.