[root@localhost ~]# ll -d /tmp
drwxrwxrwt. 4 root root 4096 Apr 19 06:17 /tmp

[root@localhost ~]# useradd lamp
[root@localhost ~]# useradd lamp1
#建立測試用戶lamp和lamp1，省略設置密碼過程
[root@localhost ~]# su -lamp
#切換為lamp用戶
[lamp@localhost ~]$ cd /tmp
[lamp@localhost tmp]$ touch ftest
#建立測試文件
[lamp@localhost tmp]$ll ftest
-rw-rw-r-- 1 lamp lamp Apr 19 06:36 ftest
[lamp@localhost tmp]$ su - lamp1
#省略輸入lamp1用戶密碼的過程，切換成lamp1用戶
[lamp1 @localhost ~]$ cd /tmp/
[lamp1 @localhost tmp]$ rm -rf ftest
rm:cannot remove 'ftest':Operation not permitted