我创建了一个脚本来在我的 CentOS 7 服务器上运行自动备份。备份存储到 /home/backup 目录。该脚本有效，但现在我想合并一种在备份发生后计算文件数的方法，如果数量超过 5，则删除最旧的备份。
以下是我的备份脚本。
#!/bin/bash
#mysqldump variables
FILE=/home/backup/databasebk_!`date +"Y-%m-%d_%H:%M"`.sql
DATABASE=database
USER=root
PASS=my password
#backup command process
mysqldump --opt --user=${USER} --password=${PASS} ${DATABASE} > ${FILE}
#zipping the backup file
gzip $FILE
#send message to the user with the results
echo "${FILE}.gz was created:"
ls -l ${FILE}.gz
# This is where I would like to count the number of files
# in the directory and if there are more than 5 I would like
# to delete the oldest …