shell编程之实现windows回收站功能分享

一. 功能简介

1. 将删除的文件放在回收站中

2. 恢复删除的文件

3. 实现linux rm命令的功能, 使用起来几乎和linux 系统自带的rm ,命令完全一样

4. 新增功能: rm -l, rm -e, rm -c

5. 该脚本每次在运行时候会检查$HOME/.trash 目录下文件大小之和, 若

超过最大容量, 脚本会自动将日志文件中所记录文件中的前一半文件从回

收站中清除,所以建议删除大文件(相对于回收站最大容量而言)直接用

命令/bin/rm 而不要用 rm.

二. 使用方法:

1. 将trash文件放到 $HOME/bin/

2. 在$HOME/.bashrc 文件中加入alias rm=”$HOME/bin/trash”, 重新登陆终端或执行bash命令。

3. 执行命令rm -e 配置回收站的最大容量,单位K

4. 回收站的默认目录为:$HOME/.trash, 默认配置文件为:$HOME/.trash/trash.conf

默认log文件为:$HOME/.trash/trash.log

5. 怎样恢复文件:

在linux 终端中输入rm -l， 然后 在RowNumber: 后面键入要删除文件所在的行标识：988 键入y/Y 然后按回车键 恢复成功.

如果想只查看删除列表, 则键入rm -l 后直接按回车键或者键入Q/q

6. 更详细的参数介绍请键入：rm –help

三. 注意事项

 1. 想要手动清空$HOME/.trash目录需要用/bin/rm命令, 请不要尝试用rm -r $HOME/.trash 的方法.

2. 该脚本不支持rm -r -f , rm -rfi (选项组合超过2个)格式.

3. 如果你可以你甚至可以用该脚本作为备份脚本， 假若想备份test2.txt你只需要执行rm test2.txt， 当然如果真想备份某个文件的话， 最好编写专门的备份脚本。

复制代码

代码如下:

#!/bin/bash

#配置回收站最大的存储空间(字节)

#maxmemory=51200 (50M)

#maxmemory=102400 (100M)

#maxmemory=512000 (500M)

#根据情况设置为50M(对于isoa服务开发来说足够了)

maxmemory=3145728

#设置回收站所在的目录

trash=$HOME/.trash

#设置日志文件所在的目录

mvlog=$trash/trash.log

from1=$1

from2=$2

var_pwd=

var_father=

#回收站若不存在，则新建之

if [ ! -e $trash ];then

 mkdir -p $trash

 chmod 755 $trash

fi

#产生7位的随机数

function rand()

{

a=(0 1 2 3 4 5 6 7 8 9 a b c d e A B C D E F)

 for ((i=0;i<7;i++))

 do

  echo -n ${a[$RANDOM%${#a[*]}]}

 done

}

random=$(rand)

#文件不存在时的提示信息

function file_null()

{

 local file=$1

 echo “rm: cannot remove $file: No such file or directory”

}

#打印参数出错后的提示信息

function echo_msg()

{

 echo -n “rm: missing operand

Try rm –help for more information.

“

}

function echo_msg2()

{

echo -n “rm: invalid option  $1

Try rm –help for more information.

“

}

#回收站管理函数

function deal()

{

local tmp=$(mktemp /tmp/tfile.XXXXXX)

 local num=$(($(cat $mvlog| wc -l)/2))

#awk -F: -v nu=$num  -v trash=$trash {if (NR<=nu) system(“rm -rf “trash”/”$2″:”$3″”);

#else print $0} $mvlog | sort -o $mvlog

awk -F: -v nu=$num  -v trash=$trash {if (NR<=nu) system(“rm -rf “trash”/”$2″:”$3″”);

else print $0} $mvlog >> $tmp

 mv $tmp $mvlog

}

JUG=

#目录处理函数

function jug_cur()

{

 local tmp=

 local dirname=$1

local jug=${dirname//*/}

 if [ “$jug” == “.” ];then

  var_pwd=${dirname/./$(pwd)}

JUG=0

 elif [ “$jug” == “..” ];then

  tm=$(pwd)

tmp=${tm%/*}

  var_father=${dirname/../$tmp}  

  JUG=1

#elif [ “$jug” == “~” ];then

#return 2

 else

JUG=2

 fi 

}

#命令不带参数时的普通文件删除函数

function rm1

{

 local filename=$(basename $from1)

 local dirname=$(dirname $from1)

jug_cur $dirname

 if [ “$JUG” -eq 0 ];then

  dirname=$var_pwd

 elif [ $JUG -eq 1 ];then

  dirname=$var_father

 fi 

if [ -d “$from1” ];then

  echo “rm: cannot remove $from1: Is a directory”

 else

  if [ ! -e $from1 ];then

   file_null $from1

else

   echo “$dirname:$filename:$random:$(date +%Y-%m-%d.%T)” >> $mvlog

mv “$from1” “$trash/$filename:$random”

  fi

 fi

}

#rm -i

function rmi()

{

 local filename=$(basename $from2)

 local dirname=$(dirname $from2)

jug_cur $dirname

 if [ $JUG -eq 0 ];then

  dirname=$var_pwd

 elif [ $JUG -eq 1 ];then

  dirname=$var_father

 fi 

if [ -f “$from2” ];then

  echo -n “rm: remove regular file $from2?”

  read answer

if [ “$answer” = y -o “$answer” = Y ];then

   echo “$dirname:$filename:$random:$(date +%Y-%m-%d.%T)” >> $mvlog

mv “$from2” “$trash/$filename:$random”

  fi

 else

  if [ ! -e $from2 ];then

   file_null $from2

  else

echo “rm: cannot remove $from2: Is a directory”

  fi

 fi

}

#rm -f

function rmf()

{

 local filename=$(basename $from2)

 local dirname=$(dirname $from2)

jug_cur $dirname

 if [ $JUG -eq 0 ];then

  dirname=$var_pwd

 elif [ $JUG -eq 1 ];then

  dirname=$var_father

 fi 

if [ -f “$from2” ];then

  echo “$dirname:$filename:$random:$(date +%Y-%m-%d.%T)” >> $mvlog

mv “$from2” “$trash/$filename:$random”

 else

  if [ ! -e $from2 ];then

   :

  else

echo “rm: cannot remove $from2: Is a directory”

  fi

 fi

}

#rm -r

function rmr()

{

 local filename=$(basename $from2)

 local dirname=$(dirname $from2)

jug_cur $dirname

 if [ $JUG -eq 0 ];then

  dirname=$var_pwd

 elif [ $JUG -eq 1 ];then

  dirname=$var_father

 fi 

if [ “$from2” = “.” -o “$from2” = “..” ];then

  echo “rm: cannot remove directory: $from2”

elif [ -e “$from2” ];then

  echo “$dirname:$filename:$random:$(date +%Y-%m-%d.%T)” >> $mvlog

mv “$from2” “$trash/$filename:$random”

 else

  file_null $from2

 fi

}

#rm -rf

function rmrf()

{

 local filename=$(basename $from2)

local dirname=$(dirname $from2)

 jug_cur $dirname

 if [ $JUG -eq 0 ];then

  dirname=$var_pwd

 elif [ $JUG -eq 1 ];then

dirname=$var_father

 fi 

 if [ “$from2” = “.” -o “$from2” = “..” ];then

echo “rm: cannot remove directory: $from2”

 elif [ -e “$from2” ];then

  echo “$dirname:$filename:$random:$(date +%Y-%m-%d.%T)” >> $mvlog

mv “$from2” “$trash/$filename:$random”

 else

  :

 fi

}

#rm -ir

function rmir()

{

 local filename=$(basename $from2)

local dirname=$(dirname $from2)

 jug_cur $dirname

 if [ $JUG -eq 0 ];then

  dirname=$var_pwd

elif [ $JUG -eq 1 ];then

  dirname=$var_father

 fi 

 if [ -e “$from2” ];then

  if [ -d “$from2” ];then

echo -n “rm: remove directory $from2?”

  else

   echo -n “rm: remove regular file $from2?”

  fi

  read answer

if [ “$answer” = y -o “$answer” = Y ];then

   echo “$dirname:$filename:$random:$(date +%Y-%m-%d.%T)” >> $mvlog

mv “$from2” “$trash/$filename:$random”

  fi

 else

  if [ ! -e $from2 ];then

   file_null $from2

  fi

 fi

}

#清空回收站

function rmc()

{

 /bin/rm -rf $trash

}

function rml()

{

 local tmp=$(mktemp /tmp/tfile.XXXXXX)

 clear

 if [ ! -d “$trash” ];then

  mkdir $trash

 fi

if [ ! -f “$mvlog” ];then

  touch $mvlog

 fi

line=$(cat -n $mvlog | awk -F: {print $1, “FileName:”$2, “Time: “$4″:”$5”:”$6})

 linecount=$(cat $mvlog | wc -l)

 echo -e “$line”

 echo

 echo

echo “[$linecount] Please enter the file you want to restore (replaced with the line number)”

 printf “RowNumber: “

 read answer

if [ “$answer” = q -o “$answer” = Q -o “$answer” = “” ];then

  :

 else

  printf “Please confirm (Y/N): “

  read answer1

if [ “$answer1” = y -o “$answer1” = Y ];then

   address=$(sed -n “$answer””p” $mvlog | awk -F: {print $1})

filename=$(sed -n “$answer””p” $mvlog | awk -F: {print $2})

filerand=$(sed -n “$answer””p” $mvlog | awk -F: {print $3})

   fullname=$address/$filename

   if [ -e “$fullname” ];then

    echo “The file exist!”

sleep 0.5

   else

    old=”$trash/$filename:$filerand”

    new=”$address/$filename”

    mv “$old” “$new”

#deline=$(cat $mvlog|sed “$answer””d” | sort -o $mvlog)

    deline=$(cat $mvlog|sed “$answer””d” >> $tmp)

    mv $tmp $mvlog

echo “restore success!”

    sleep 0.5

   fi

  fi

 fi

}

function help()

{

 cat << EOF

Usage: rm [OPTION]… FILE…

Remove (unlink) the FILE(s).

-f, –force   ignore nonexistent files, never prompt

-i, –interactive prompt before any removal

–no-preserve-root do not treat `/ specially (the default)

–preserve-root   fail to operate recursively on `/

-r, -R, –recursive   remove directories and their contents recursively

–help display this help and exit

By default, rm does not remove directories.  Use the –recursive (-r or -R)

option to remove each listed directory, too, along with all of its contents.

To remove a file whose name starts with a `-, for example `-foo,

use one of these commands:

rm — -foo

rm ./-foo

Note that if you use rm to remove a file, it is usually possible to recover

the contents of that file.  If you want more assurance that the contents are

truly unrecoverable, consider using shred.

Report bugs to .

EOF

}

#脚本开始

#检测回收站已用存储空间，如果已经达到最大值，则删除日志文件中位于前面的一半的文件

mem=$(du -s $trash|awk {print $1})

if [ “$mem” -gt $maxmemory ];then

 deal

fi

if [ “$#” -eq 0 ];then

 echo_msg

fi

if [ “$#” -eq 1 ];then

 case “$from1” in

  -i)

  echo_msg

  -f)

echo_msg

  -r | -R)

  echo_msg

  -ir|-ri|-iR|-Ri|-if|-fi|-rf|-fr|-Rf|-fR)

  echo_msg

  -l)

  rml

  -c)

  rmc

  –help)

  help

  -*)

echo_msg2 $from1

  *)

  rm1

 esac

fi

if [ “$#” -ge 2 ];then

 until  [ “$2” = “” ]

 do

  from2=$2

  case “$from1” in

   -i)

   rmi

   -f)

rmf

   -r|-R)

   rmr

   -l)

   rml

   -rf|-Rf|-fr|-fR)

   rmrf

   -ir|-ri|-iR|-Ri)

   rmir

   -if|-fi)

   rmf

   –help)

   help

   exit 1

   -*)

echo_msg2 $from1

   exit 1

   *)

   {

    until [ “$1” = “” ]

    do

     from1=$1

     rm1

     shift

    done

   }

  esac

  shift

 done

fi

exit