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1. Is it a typo that Friday's file is missing the 05 i.e. should abc_def_YYYYMMDD above be abc_def_05_YYYYMMDD

2. if the files are sorted by the YYYYMMDD part of the file name will this do the...

3 examples:
cnt=`tr -dc '[0-9]' < count`
echo "$cnt"
cnt=`sed 's/[^0-9]//g' count`
echo "$cnt"
IFS="=" read junk cnt < count
echo "$cnt"
echo "$junk"

Can you change the filenames to better match your problem? If they were YYYYMMDD_05_abc, for FILE in * would spit them out in ascending date order.