在linux下， 用rm是比較危險的， 刪除了的檔案不會放到所謂的回收站中， 有很多因rm而“一失足成一天恨”的例子， 下面， 我們考慮來定製一個delete命令， 並模擬做一個回收站， 這樣， 即使delete檔案/目錄， 也會放在自建的回收站中， 相對比較安全。

       用shell script來實現， delete文字檔案的內容為：

#! /bin/bash
#  customize a relatively safer command, namely delete, to substitute rm


# create a dustbin if necessary
if [ ! -d ~/.RecycleBin ]
then 
        mkdir ~/.RecycleBin
fi

# necessary, the shell script file(delete) and the file/directory to be deleted(e.g. a.txt or folder) are not necessarily in the same directory
current_dir=`pwd`

if [ $# -eq 0 ]
then 
        echo "Usage: delete file1 [file2 file3 ...]"   # guide to use delete
else 
        echo "My dear, you are about to delete --- :"
        echo 
 
[email protected]
		
        read -p "Are you sure to delete it(them)? [y/n]:" user_answer
        if [ "$user_answer" == "y" ] || [ "$user_answer" == "Y" ]
        then  
                for file in [email protected]
                do 
						if [ ${file:(-1)} == "/" ]   # last character
						then
							file=${file%?}  #  cut the last /
						fi
						
                        if [ -f "$current_dir/$file" ] || [ -d "$current_dir/$file" ]
                        then
								# calculate the current date
								current_date=`date`
								current_date=${current_date// /_}     # replace blank with _
								
								dest_file="${file}__DelTime:$current_date"
									
								mv "$current_dir/$file"  "$current_dir/$dest_file"
								mv "$current_dir/$dest_file" ~/.RecycleBin     # move the file/directory to dustbin, not "~/.RecycleBin", but ~/.RecycleBin
						else
                                echo "$file: No such file or directory, my dear!"
                        fi
                done
        else
                echo "No file or directory removed"
        fi
fi
 

       注意， 要對檔案加可執行許可權。

       我們查閱一下PATH的值， 並把delete這個檔案放到對應的目錄下（如果沒有， 可以自建一個目錄）， 然後執行一系列的操作， 結果如下：

[[email protected] learn_shell]$ echo $PATH
/usr/local/bin:/usr/bin:/bin:/usr/local/sbin:/usr/sbin:/sbin:/home/taoge/bin:/home/taoge/bin
[[email protected] learn_shell]$ ls /home/taoge/bin/delete 
/home/taoge/bin/delete
[
 
[email protected] learn_shell]$ ls ~/.RecycleBin/
[[email protected] learn_shell]$ ls
[[email protected] learn_shell]$ touch a.txt; mkdir folder
[[email protected] learn_shell]$ delete a.txt folder
My dear, you are about to delete --- :
a.txt folder
Are you sure to delete it(them)? [y/n]:y
[[email protected] learn_shell]$ touch a.txt; mkdir folder
[[email protected] learn_shell]$ delete a.txt folder/
My dear, you are about to delete --- :
a.txt folder/
Are you sure to delete it(them)? [y/n]:y
[[email protected] learn_shell]$ 
[[email protected] learn_shell]$ 
[[email protected] learn_shell]$ 
[[email protected] learn_shell]$ ls -l ~/.RecycleBin/
total 8
-rw-rw-r-- 1 taoge taoge    0 May  9 22:15 a.txt__DelTime:Sat_May__9_22:16:13_PDT_2015
-rw-rw-r-- 1 taoge taoge    0 May  9 22:16 a.txt__DelTime:Sat_May__9_22:16:38_PDT_2015
drwxrwxr-x 2 taoge taoge 4096 May  9 22:15 folder__DelTime:Sat_May__9_22:16:13_PDT_2015
drwxrwxr-x 2 taoge taoge 4096 May  9 22:16 folder__DelTime:Sat_May__9_22:16:38_PDT_2015
[[email protected] learn_shell]$ 

       OK,  本文先介紹到這裡， 上述程式基本能滿足要求。 當然， 要做到非常穩健， 還是有一些地方需要改進的(比如， 如果檔案或者目錄中有空格， 則上述程式碼有錯)。