Shell Programming and Scripting

Hi bluemind2005,
I note that in post #1 in this thread you say you want files from the last hour of one day and the first 23 hours of the next day. I also note that all of the suggestion solutions so far would process 24 hours from a single day (i.e., access_log2016-08-24.00.log through access_log2016-08-24.23.log) instead of what you requested. (And, I must say that the suggested solutions make a lot more sense to me.)

In bash-4 an associative array can eliminate the duplicates

Code:

declare -A files
for i in access*
do
  files[${i%%.*}]=
done

for filename in ${!files[@]}
do
  cat "$filename".* > "$filename" 
done