timenow=$(date \+\%Y\%m\%d)

#common variables:
retention_days="31"		#after this value your dumps will be automatically pruned
basedir="/mnt/backup/_MYSQLDUMP/"	#leave a trailing "/" . basedirectory where you will save the backups, the folders up to mysql_basedir must be manually created

#specific variables:
mysql_basedir="MYSQL_PRD/"	#leave a trailing "/" . directory where your backup will be saved (in $basedir)
mysql_host="CHANGEME"		#your mysql/mariadb db host
mysql_user="bck_user"		#your mysql/mariadb READONLY user
mysql_pass="CHANGEME"		#your mysql/mariadb READONLY user pass
mysql_suff="CHANGEME_"		#leave a trailing unserscore. suffix for the folder that will be created like this: /basedir/mysql_basedir/mysql_suff_timenow
mysql_dir=$basedir$mysql_basedir$mysql_suff$timenow

mkdir $mysql_dir
cd $mysql_dir
mysql -h $mysql_host -u $mysql_user -p$mysql_pass -N -e 'show databases' | while read dbname; do mysqldump -h $mysql_host -u $mysql_user -p$mysql_pass --compress "$dbname" | gzip -c > "$dbname".sql.gz; done

find $basedir$mysql_basedir -type d -mtime +$retention_days -name $mysql_suff* -exec rm -rf {} \;