Usage: gdaltindex [--help] [--long-usage] [--help-general]
                  [-overwrite] [-recursive] [-filename_filter <val>]...
                  [-min_pixel_size <val>] [-max_pixel_size <val>]
                  [-of <output_format>] [-tileindex <field_name>]
                  [-write_absolute_path] [-skip_different_projection]
                  [-t_srs <srs_def>] [-src_srs_name <field_name>]
                  [-src_srs_format {AUTO|WKT|EPSG|PROJ}] [-lyr_name <name>]
                  [-lco <NAME>=<VALUE>]... [-gti_filename <filename>]
                  [-tr <xres> <yres>] [-te <xmin> <ymin> <xmax> <ymax>]
                  [-ot <datatype>] [-bandcount <val>] [-nodata <val>]...
                  [-colorinterp <val>]... [-mask] [-mo <name>=<value>]...
                  [-fetch_md <gdal_md_name> <fld_name> <fld_type>]... [--quiet]
                  <index_file> <file_or_dir>...

Note: gdaltindex --long-usage for full help.