I have 50 files in this directory (/home/unixnewbie/wklyfiles) namely:
statistics.1
statistics.2
statistics.3
statistics.4
statistics.5
statistics.6
statistics.7
statistics.8
statistics.9
statistics.10
....
statistics.20
....
statistics.50

How can i determine if ever there will be some files missing in there?
And how to know which exact files are those? Like for example, the statistics.5, statistics.9, statistics.20 and statistics.35 files are missing that week.

Thanks in advance.