安全的delete命令

   系統的rm命令經常致使一些不愉快的事情。默認狀況下rm 不會在刪除文件前提是用戶是否真的想這麼作，刪除後也不能再從系統中恢復。這意味着用戶不得不爲本身的意識糊塗付出慘痛的代價。

   設計一個相對「安全」的delete命令來替代rm。一下是代碼，請各位驗收

##創建回收站機制
##將須要刪除的文件移動到~/.trash中
if [ ! -d ~/.trash ]
then
        mkdir ~/.trash
fi

if [ $# -eq 0 ]
then
        #提示delete的用法
        echo "Usage:delete file1 [file2 file3 ...]"
else
        echo "You are about to delete these files:"
        echo $@
        #要求用戶確認是否刪除這些文件。回答N或n放棄刪除，其餘字符表示確認
        read -p "Are you sure to do that? [Y/n]:" reply
        if [ "$reply" != "n" ] && [ "$reply" != "N" ]
        then 
                for file in $@
                do
                        #判斷文件活目錄是否存在
                        if [ -f "$file" ] || [ -d "$file" ]
                        then
                                mv -b "$file" ~/.trash/
      else
                                echo "$file: NO such file or directory"
                        fi
                done
        #若是用戶回答N或n
        else
                echo "NO file removed"
        fi
fi


# 這個delete不完美， 他不能處理文件名中存在空格的狀況 # touch "zhang san" # delete zhang\ san You are about to delete these files: zhang san Are you sure to do that? [Y/n]:y zhang: NO such file or directory san: NO such file or directory