gdalenhance --version (return code: 0)
GDAL 2.2.1, released 2017/06/23
gdalenhance -h (return code: 1)
Option -h incomplete, or not recognised.
Usage: gdalenhance [--help-general]
[-of format] [-co "NAME=VALUE"]*
[-ot {Byte/Int16/UInt16/UInt32/Int32/Float32/Float64/
CInt16/CInt32/CFloat32/CFloat64}]
[-src_scale[_n] src_min src_max]
[-dst_scale[_n] dst_min dst_max]
[-lutbins count]
[-s_nodata[_n] value]
[-stddev multiplier]
[-equalize]
[-config filename]
src_dataset dst_dataset
GDAL 2.2.1, released 2017/06/23