关于shell:shell-备份文件脚本自动清理

主动清理超出备份数的最老备份文件

#! /usr/bin/env bash# 备份目录bak_dir="../bak"# 备份最大数量bak_max=5# 备份文件名固定为如下格局# archive.tar.gzecho -n "请输出备份版本号:"read versionif [ -f ./archive.tar.gz ];then  echo "clean archive.tar.gz"  rm -rf archive.tar.gzfitar -zcf archive.tar.gz ./*if [ ! -d $bak_dir ];then  mkdir $bak_dirfibak_file="${bak_dir}/archive.${version}.tar.gz"# 已存在备份文件 则做笼罩if [ -f $bak_file ];then  rm $bak_fileficp archive.tar.gz $bak_fileecho "baking success $bak_file"# 革除老的备份bak_cnt=$(ls -l $bak_dir | grep "^-" | wc -l)echo "bak cnt $bak_cnt"while (( $bak_cnt > $bak_max )); do  oldest_file=$(ls -rt $bak_dir | head -1) #获取最旧的备份  echo "delete old file: "$oldest_file  rm -rf $bak_dir/$oldest_file  let "bak_cnt--"doneecho "----  bak file list ----"ls -l $bak_dir | egrep "^-|^d"echo "----  bak file list ----"

可执行权限

chmod a+x bak.sh