12-10-2016
You lost me. I couldn't imagine WHAT you really need.
In post#1, you cat all matching files into a pipe to awk and then sum into array a indexed by FILENAME. As there's only ONE single stream (by cat), there will be just one element with index "-".
- This has been cured in the proposals by greet_sed and RavinderSingh13.
Still your problem is not clear.
The count of lines with substr ($5,1,8) matching $DATE CANNOT depend on the index ($2 / $4 ?) of the a array. WHY should there be different counts (2540 <-> 2498)?
And, 20161208 doesn't match $5 in your sample, so count must be zero.
Why don't you take a step back and start over, carefully (re)formulating your specification, supplying a reasonable set of input data and a desired output format, and the logics connecting the two?
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