【Linux】文件备份脚本

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#!/bin/bash
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backup_num=3
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function help() {
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  echo "-in 源文件路径"
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  echo "-out 备份路径"
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  echo "-backup_num 备份数量"
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  echo "-inKey 使用公钥加密，详情：https://github.com/Rehtt/archive"
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  echo "-genKey 生成密钥对，详情：https://github.com/Rehtt/archive"
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  exit 0
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}
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while [ $# -gt 0 ]; do
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  case $1 in
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  -in)
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    in_path="$2"
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    shift
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    ;;
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  -out)
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    out="$2"
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    shift
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    ;;
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  -backup_num)
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    backup_num=$2
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    shift
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    ;;
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  -inKey)
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    inKey="$2"
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    shift
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    ;;
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  -genKey)
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    archive -generateRsaKey
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    exit 0
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    shift
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    ;;
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  -help)
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    help
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    ;;
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  -h)
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    help
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    ;;
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  esac
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  shift
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done
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if [ x"$in_path" = x ]; then
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  help
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fi
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if [ x"$out" = x ]; then
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  help
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fi
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filename=$(basename "$in_path")
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tmp_file="/tmp/$filename-$(date +%Y-%m-%d).tar.xz"
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out="$out/$filename"
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function get_last_file() {
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  local time=1
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  del_file=""
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  file_num=0
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  while [ $# -gt 0 ]; do
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    local name=$1
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    local name=${name##*/}
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    local t=$(echo $name | grep -o '[[:digit:]]\{4,\}-[[:digit:]]\{1,2\}-[[:digit:]]\{1,2\}')
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    if [ x"$t" = x ]; then
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      shift
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      continue
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    fi
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    local date_str=$(date +%s -d "$t")
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    file_num=$(($file_num + 1))
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    #    echo $name
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    local now=$(date +%s)
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    if [[ $(($now - $date_str)) -gt $time ]]; then
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      local time=$(($now - $date_str))
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      del_file=$name
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    fi
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    shift
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  done
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}
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#判断是否加密
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if [ x"$inKey" = x ]; then
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  tar -Jcvf "$tmp_file" "$in_path"
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else
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  tmp_file=$tmp_file.d
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  if [ x"$(which archive)" = x ]; then
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    echo "缺少archive"
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    help
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  fi
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  archive -a -e -inKey "$inKey" -in "$in_path" -out "$tmp_file"
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fi
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# 判断是本地保存还是用rclone保存
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if [[ $(echo "$out" | grep ":") != "" ]]; then
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  if [ x"$(which rclone)" = x ]; then
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    echo "缺少rclone"
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    help
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  fi
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  rclone mkdir "$out"
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  list=$(rclone ls "$out")
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  get_last_file $list
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  while [ $file_num -ge $backup_num ]; do
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    rclone delete "$out/$del_file"
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    list=$(rclone ls "$out")
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    get_last_file $list
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  done
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  rclone copy "$tmp_file" "$out"
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else
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  mkdir -p "$out"
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  list=$(ls "$out")
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  get_last_file $list
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  while [ $file_num -ge $backup_num ]; do
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    rm -f "$out/$del_file"
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    list=$(ls "$out")
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    get_last_file $list
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  done
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  cp "$tmp_file" "$out"
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fi
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rm -f "$tmp_file"