shell 备份文件脚本+自动清理

自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式
# archive.tar.gz

echo -n "请输入备份版本号:"
read version

if [ -f ./archive.tar.gz ];then
  echo "clean archive.tar.gz"
  rm -rf archive.tar.gz
fi

tar -zcf archive.tar.gz ./*

if [ ! -d $bak_dir ];then
  mkdir $bak_dir
fi

bak_file="${bak_dir}/archive.${version}.tar.gz"

# 已存在备份文件 则做覆盖
if [ -f $bak_file ];then
  rm $bak_file
fi

cp archive.tar.gz $bak_file
echo "baking success $bak_file"

# 清除老的备份
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--"
done

echo "----  bak file list ----"
ls -l $bak_dir | egrep "^-|^d"
echo "----  bak file list ----"

可执行权限

chmod a+x bak.sh

在想要备份的文件夹下执行 ./bak.sh 即可