Compare 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.
grib_compare [options] grib_file grib_file
-r
Compare files in which the messages are not in the same order. This option is time expensive.
-b key,key,...
All the keys in this list are skipped in the comparison. Bit-by-bit compare on.
-e
Edition independent compare. It is used to compare grib edition 1 and 2.
-c key[:l/d/s/n],key[:l/d/s/n],...
Only the listed keys or namespaces (:n) are compared. The optional letter after the colon is used to force the type in the comparison: l->integer, d->float, s->string, n->namespace.See -a option. Incompatible with -H option.
-S start
First field to be processed.
-E end
Last field to be processed.
-a
-c option modifier. The keys listed with the option -c will be added to the list of keys compared without -c.
-H
Compare only message headers. Bit-by-bit compare on. Incompatible with -c option.
-R key1=relative_error1,key2=relative_error2,...
Compare floating point values using the relative error as tolerance.key1=relative_error will compare key1 using relative_error1.all=relative_error will compare all the floating point keys using relative_error. Default all=0.
-A absolute error
Compare floating point values using the absolute error as tolerance.Default is absolute error=0
-P
Compare data values using the packing error as tolerance.
-T factor
Compare data values using factor multiplied by the tolerance specified in options -P -R -A.
-w key[:{s/d/l}]{=/!=}value,key[:{s/d/l}]{=/!=}value,...
Where clause.Grib 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 (key:l)type can be specified. Default type is string.
-f
Force. Force the execution not to fail on error.
-V
Version.
-7
Does not fail when the message has wrong length
-v
Verbose.