linux下删除文件夹的软链接时注意千万不能在后面加反斜杠，千万

今天遇到一个坑，自己在子目录下创建了父目录的软链接，导致可以无限循环进入父目录

[[email?protected] dir1]$ ll
total 8
-rw-rw-r-- 1 clouder clouder  4 Oct  9 17:49 a.txt
-rw-rw-r-- 1 clouder clouder  4 Oct  9 17:49 b.txt
lrwxrwxrwx 1 clouder clouder 10 Oct  9 17:49 dir1 -> /tmp/dir1/
[[email?protected] dir1]$ cd dir1/
[[email?protected] dir1]$ cd dir1/
[[email?protected] dir1]$ cd dir1/
[[email?protected] dir1]$ cd dir1/
[[email?protected] dir1]$ cd dir1/
[[email?protected] dir1]$ cd dir1/
[[email?protected] dir1]$ cd dir1/
[[email?protected] dir1]$ cd dir1/
[[email?protected] dir1]$ cd dir1/
[[email?protected] dir1]$ cd dir1/
[[email?protected] dir1]$ ls
a.txt  b.txt  dir1
[[email?protected] dir1]$ pwd
/tmp/dir1/dir1/dir1/dir1/dir1/dir1/dir1/dir1/dir1/dir1/dir1

然后想把这个软链接删除，于是在终端输入

linux终端下，常利用自动补全功能，输入部分文件名，如di，然后按tab键，自动补全，结果自己带上了后面的反斜杠；
然后 被告知这是个文件夹

[[email?protected] dir1]$ rm dir1/       
rm: cannot remove ‘dir1/’: Is a directory

于是我加上-rf （f表示强制r表示删除递归删除，用于删除文件夹）
结果悲剧了，当文件夹dir1的软链接dir1在原文件的子目录，则rm -rf 软链接目录也会把源文件删除！！！

[[email?protected] dir1]$ rm -rf dir1/      
[[email?protected] dir1]$ ll   
total 0

下面做一个实验，在另外一个目录dir2下创建dir1的软链接，强制删除软链接：rm -f dir1 也会把源目录删除!!!
准备源目录dir1，里面有a.txt,b.txt文件

[[email?protected] tmp]$ cd dir1/
[[email?protected] dir1]$ echo 'aaa'>a.txt
[[email?protected] dir1]$ echo 'aaa'>b.txt
[[email?protected] dir1]$ ll
total 8
-rw-rw-r-- 1 clouder clouder 4 Oct  9 17:26 a.txt
-rw-rw-r-- 1 clouder clouder 4 Oct  9 17:26 b.txt

进入目标目录/tmp/dir2，创建/tmp/dir1目录的软链接

[[email?protected] dir1]$ cd ../dir2 
[[email?protected] dir2]$ ll
total 0
[[email?protected] dir2]$ ln -s /tmp/dir1 .
[[email?protected] dir2]$ ll
total 0
lrwxrwxrwx 1 clouder clouder 9 Oct  9 17:26 dir1 -> /tmp/dir1

用file命令查看文件类型，注意软链接目录没带反斜杠是链接

[[email?protected] dir2]$ file dir1 
dir1: symbolic link to `/tmp/dir1'

删除目录的软链接文件成功（此处因为我用命令别名alias rm=‘rm -i‘ ，所以在我本机用rm命令时，都会提示是否确认删除）

[[email?protected] dir2]$ rm dir1   
rm: remove symbolic link ‘dir1’? y
[[email?protected] dir2]$ ls
[[email?protected] dir2]$ ls /tmp/dir1/
a.txt  b.txt

在创建一个软链接

[[email?protected] dir2]$ ln -s /tmp/dir1/ .
[[email?protected] dir2]$ ll
total 0
lrwxrwxrwx 1 clouder clouder 10 Oct  9 17:27 dir1 -> /tmp/dir1/

file命令查看dir1/ 是什么类型，软链接目录带了反斜杠就当成目录了

[[email?protected] dir2]$ file dir1/ 
dir1/: directory

删除软链接目录提示这是一个文件夹

[[email?protected] dir2]$ rm dir1/  
rm: cannot remove ‘dir1/’: Is a directory

强制删除软链接目录（文件夹）没有成功

[[email?protected] dir2]$ rm dir1/ -rf  
[[email?protected] dir2]$ ll
total 0
lrwxrwxrwx 1 clouder clouder 10 Oct  9 17:27 dir1 -> /tmp/dir1/

强制删除软链接目录提示这是一个目录

[[email?protected] dir2]$ rm -f dir1/   
rm: cannot remove ‘dir1/’: Is a directory

强制删除软链接文件，结果把原始文件给删了！！！

[[email?protected] dir2]$ rm -f dir1  
[[email?protected] dir2]$ ll
total 0
[[email?protected] dir2]$ ll /tmp/dir1/
total 0