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If you would show us what your input file really looks like, there would probably be no need to create a separate file.

Do the contents of part1.csv look like the sample input file you supplied in the 1st posting on this thread? (It is unusual to use the .csv filename extension when there are no commas and only one...

Sorry. I thought it was pretty obvious. But, I see that I left in a debugging statement that probably confused things.

The corrected script is:
awk '{ c[$1]++}
END { for(h = 0; h <= 23;...

Since the title of this thread includes "sorting", I assume that your real input is not already sorted by time like you sample input file. The following should do what you want:
awk '{ c[$1]++}...