shell命令备份文件夹

用shell命令备份文件夹放到指定位置，并加密压缩文件。

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#!/bin/bash
# 定义文件夹路径
folder_path="/var/log/syslog"
# 定义压缩包存储路径
backup_path="/opt/backups"
# 定义压缩包文件名前缀
backup_pre="syslog_"
# 定义加密压缩包(1.加密 0.不加密)
backup_encrypt=1
# 定义压缩包密码
backup_password="MyPasswd"
# 定义备份文件个数(按照时间排序)
backup_max_files=10

# 打包文件夹为压缩包（基于日期和时间）
if (($backup_encrypt == 1)); then
    # 加密压缩包
    backup_filename="$backup_pre$(date +%Y%m%d%H%M%S).des3.pbkdf2.tar.gz"
    tar -czvPf - "$folder_path" | openssl des3 -salt -pbkdf2 -k ${backup_password} | dd of="${backup_path}/${backup_filename}"
else
    # 不加密压缩包
    backup_filename="$backup_pre$(date +%Y%m%d%H%M%S).tar.gz"
    tar -czvPf "${backup_path}/${backup_filename}" "${folder_path}"
fi
echo backup file "${backup_path}/${backup_filename}"

# 获取备份文件列表
backup_files=($(ls -t "${backup_path}"))

# 检查备份文件数量
num_backup_files=${#backup_files[@]}

# 如果备份文件数量大于10，则删除多余的文件
if ((num_backup_files > backup_max_files)); then
    files_to_delete=$((num_backup_files - backup_max_files))
    for ((i=backup_max_files; i<$num_backup_files; i++)); do
        file_to_delete="${backup_path}/${backup_files[$i]}"
		echo delete file $file_to_delete
        rm -f "$file_to_delete"
    done
fi

echo 'done'

tar加密文件也可使用以下方式

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$ tar -czvPf - "$folder_path" | openssl des3 -salt -pbkdf2 -k ${backup_password} > "${backup_path}/${backup_filename}"

解密文件

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$ openssl des3 -d -salt -pbkdf2 -k MyPasswd -in xxxx_encypt.des3.pbkdf2.tar.gz -out xxxx_decrypt.tar.gz

解密文件后直接在当前路径解压

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$ openssl des3 -d -salt -pbkdf2 -k MyPasswd -in xxxx_encypt.des3.pbkdf2.tar.gz | tar zxvf -