Unknown option `-x'.
usage:
nagg [OPTIONS] <input_file>...
OPTIONS
    -h, --help
       Print command syntax; also list valid types and packaging groupings.
    -V, --version
       Print version.
    -t <list>,  --type=<list>
       <list> specifies a comma separated list of NPP record type mnemonics.
       Unless -S is specified, the granule types will be packaged together.
       Types must be compatible to be packaged together. (Use -h to list
       valid package groupings). If –t is not specified, -g <list> must be
       given to aggregate only the Geolocation product granules.
    -n <N>,  --number=<N>
       <N> is the number of granules of each product in each aggregate file;
       must be greater than zero. If not specified, default is 1 (single 
       granule files).
    -A <t>
       <t> is the number of seconds of aggregation time span of each
       aggregate file; must be a positive integer. It is exclusive with the
       -n option.
    -g <criterion>, --geolocation=<criterion>
       <criterion> is the criterion for searching the Geolocation granules
          no  | 0: Aggregate product files without Geolocation input or output.
          yes | 1: (Default) Allow approximate matching of Geolocation input
                   filenames.
       strict | 2: Require exact matching of Geolocation input filenames.
       <geoproduct>: aggregate Geolocation product <geoproduct> only.
                   This excludes the use of -t.
    -d <directory>, --directory=<directory>
       <directory> is name of an existing directory in which the output NPP
       files are created.  Default is to create output files in the current
       directory.
    -S, --simple
       Simple aggregates are produced. Each type is packaged separately.
       Default is all types are packaged in a file.
    -O <origin>
       <origin> is the origin identifier, a four character string (required) 
    -D <domain>
       <domain> is the domain identifier, a three character string (required)
    --debug
       Read in all granules in the input files, including those not specified
       by the -t list. Display all the granules and end the execution without
       generating the normal output files.
       Note that this option is intended for tool debugging. Files or output
       generated should not be used for production purpose. Its behavior may
       change from version to version.

    <input_file> is a list of one or more NPP files