一个安全删除文件的shell命令

一个安全删除文件的shell命令

 

以下脚本中的函数可以安全用来删除

delete xxxx

该命令会将xxx文件（或目录（不要再目录后加/））移动的~/backup下面，并同时打上时间标签，通过运行

delete_old

会将~/backup目录下的超过3000M的最旧的文件或目录删除掉，希望数据保护还是有一定的用处

 

# Description:  This function used to move some useless files in current folder to ~/backup/

#      Author:  fulinux

#     Version:  1.0.0 (Release by fulinux on 8th April. 2013)

 

 

function delete ()

{

   if [ -z $1 ]; then

      echo "delete it to backuo directory"

      echo "Usage: $FUNCNAME [express]"

      echo "Example: $FUNCNAME fulinux/"

      return;

   fi

 

 

   express=$1

   timestamp=$(date +%Y%m%d%H%M%S)

 

 

   rechristen=$1.$timestamp

 

 

   mv "$express" ~/backup/"$rechristen"

}

 

 

# Description:  This function used to search dir to fetch the oldest file

#      Author:  fulinux

#     Version:  1.0.0 (Release by fulinux on 8th April. 2013)

 

 

searchdir()

{

    oldestfile=`ls -rt | head -n 1 |awk '{print $1}'`

}

 

 

# Description:  This function used to remove oldest useless files in ~/backup folder if its size is more than 4000M

#      Author:  fulinux

#     Version:  1.0.0 (Release by fulinux on 8th April. 2013)

 

 

#This is the directory where backup files are kept

backup=~/backup

#maximum useless files

alarmrate=3000

 

 

function delete_old()

{

    cd $backup

    while true;

    do

        backup_size=`du -ms $backup | awk '{print $1}'`

        if [ $backup_size -gt $alarmrate ];

        then

            searchdir

            delete $oldestfile

        else

            break;

        fi

    done

}