Directory

If you want to do it recursive, use find to locate the indicated directory most recent file (on the tree).
Then, take the file, and break the loop, indicate that the next file (the most recent unique file) is the find result file.

Here is an example code, of modificated lines, excluding *.ini, *.tm? and *.db files:

# Loop through each provided directory.
for dir in $dirs
do
check_file=
let "DIR_COUNT += 1" > /dev/null

# Check if dir exists.
full_path=${base_dir}${dir}

#Agregado por Cristian Barreto
full_path_archivo=`find $full_path -not -name "*.tm?" -not -name "*.ini" -not -name "*.db" $
indiceBarra=`expr match "$full_path_archivo" ".*/"`
full_path=`echo $full_path_archivo | cut -c 1-$indiceBarra`
#FIN del agregado
if [ -d "$full_path" ]; then
file_list=$full_path_archivo
# Cycle through files, looking for a checkable file.
for next_file in "$file_list"
do next_filepath=$full_path_archivo
if [ "$check_dirs" ]; then
# Check if it's a file or directory.
if [ -f "$next_filepath" ] || [ -d "$next_filepath" ]; then
check_file=1
fi

.
.
.
.
break #at the end of loop
done

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done!, remember that $next_filepath must have "$next_filepath" and "${next_filepath}" to support file names with blank spaces like Windows file names.

Sorry for my bad english.