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One idea is to create a reference file with "touch" with a timestamp at the start of the day, then compare the timestamp.
Not tested with your exact shell.

YYYYMMDD="`date +%Y%m%d`" #...

Also try,


do [[ -e "$line" ]] && let counter=counter+1 || echo "$line not found" ; done < input_file.txt

Please post sample input and sample output making it clear whether you are checking whether files exist in the current directory or whether you are checking whether file names are contained in a file...