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DESCRIPTION

Compare grib GRIB messages contained in two files. If some differences are found it fails returning an error code. Floating-point values are compared exactly by default, different tolerance can be defined see -P -A -R. Default behaviour: absolute error=0, bit-by-bit compare, same order in files.

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grib_compare [options] grib_file file1 grib_file file2

OPTIONS

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Compare files in which the messages are not in the same order. This option is time expensive.

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Edition independent compare. It is used to compare grib GRIB edition 1 and 2.

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Enable two-way comparison.

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Only the listed keys or namespaces (:n) are compared. The optional letter after the colon is used to force the type in the comparison: li->integer, d->float, s->string, n->namespace. See -a option. Incompatible with -H option.

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Compare only message headers (everything except data and bitmap). Bit-by-bit compare on. Incompatible with -c option.

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Compare floating-point values using the relative error as tolerance. key1=relative_error error1 will compare key1 using relative_error1. all=relative_error will compare all the floating-point keys using relative_error. Default all=0.

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Compare floating-point values using the absolute error as tolerance. Default is absolute error=0

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Where clause. Messages are processed only if they match all the key/value constraints. A valid constraint is of type key=value or key!=value. For each key a string (key:s) or , a double (key:d) or a long an integer (key:li) type can be specified. Default type is string. In the value you can also use the forward-slash character '/' to specify an OR condition (i.e. a logical disjunction) Note: only one -w clause is allowed.

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Force. Force the execution not to fail on error.

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