The "count" key is the message number in a given file whereas "countTotal" is the message number in a set of files. The former gets reset for every input file on the command line but the latter keeps on increasing.
Here is an example:
% grib_count -v file1 file2
1 file1
5 file2
6 total
% grib_ls -p count,countTotal,shortName file1 file2
file1
count countTotal shortName
1 1 t
1 of 1 messages in file1
file2
1 2 msl
2 3 tcc
3 4 tcw
4 5 str
5 6 2t
5 of 5 messages in file2
6 of 6 total messages in 2 files
So the count for the 1st message of the 2nd file is 1 (reset) but countTotal is 2.
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