Check that fallback last access file exists

Use regex to check instead of empty string.
A comment could be set instead of a date

bin/check_last_login.sh

@@ -131,14 +131,25 @@ for ssh_group in ${ssh_groups[@]}; do
 		# check user create time, if we have set it in comment
 		user_create_date_string=$(cat /etc/passwd | grep "${username}:" | cut -d ":" -f 5);
 		# if empty try last password set time
-		if [ -z "${user_create_date_string}" ]; then
+		if ! [[ "${user_create_date_string}" =~ ^\d{4}-\d{2}-\{2} ]]; then
 			# user L 11/09/2020 0 99999 7 -1
 			user_create_date_string=$(passwd -S ${username} | cut -d " " -f 3);
 		fi;
 		# last try is user home .bash_logout
-		if [ -z "${user_create_date_string}" ]; then
-			home_dir=$(cat /etc/passwd | grep "${username}:" | cut -d ":" -f 6)"/.bash_logout";
-			user_create_date_string=$(stat -c %Z "${home_dir}");
+		if ! [[ "${user_create_date_string}" =~ ^\d{4}-\d{2}-\{2} ]]; then
+			# try logout or bash history
+			home_dir_bl=$(cat /etc/passwd | grep "${username}:" | cut -d ":" -f 6)"/.bash_logout";
+			home_dir_bh=$(cat /etc/passwd | grep "${username}:" | cut -d ":" -f 6)"/.bash_history";
+			# check that this file exists
+			if [ -f "${home_dir_bl}" ]; then
+				user_create_date_string=$(stat -c %Z "${home_dir_bl}");
+			elif [ -f "${home_dir_bh}" ]; then
+				user_create_date_string=$(stat -c %Z "${home_dir_bh}");
+			fi;
+		fi;
+		# still no date -> set empty
+		if ! [[ "${user_create_date_string}" =~ ^\d{4}-\d{2}-\{2} ]]; then
+			user_create_date_string="";
 		fi;
 
 		# below only works if the user logged in, a lot of them are just file upload
@@ -158,7 +169,7 @@ for ssh_group in ${ssh_groups[@]}; do
 			found=$(grep "${username};" "${AUTH_LOG}");
 		fi;
 		# always pre work account dates if they exist, but output only if text
-		if [ -z "${found}" ] && [ ! -z "${user_create_date_string}" ]; then
+		if [ ! -z "${user_create_date_string}" ]; then
 			user_create_date=$(echo "${user_create_date_string}" | date +"%s" -f -);
 			# if all empty, we continue with only check if user has last login date
 			# else get days since creation