不废话，直接上命令操作。记录备案以后方便查阅
[root@xxxxxxx .ssh]# rm -rf authorized_keys2
rm: 无法删除"authorized_keys2": 不允许的操作
[root@xxxxxxx .ssh]# sudo chmod +wrx authorized_keys2
chmod: 更改"authorized_keys2" 的权限: 不允许的操作
[root@xxxxxxx .ssh]# ll
总用量 12
-rw-r--r-- 1 root root 386 Apr 13 12:41 authorized_keys2
-rw------- 1 root root 1743 Apr 20 11:27 id_rsa
-rw-r--r-- 1 root root 399 Apr 20 11:27 id_rsa.pub
[root@xxxxxxx .ssh]# lsattr authorized_keys2
-u--ia-------e- authorized_keys2
[root@xxxxxxx .ssh]# chattr -d authorized_keys2
[root@xxxxxxx .ssh]# lsattr id_rsa
-------------e- id_rsa
[root@xxxxxxx .ssh]# chattr -i authorized_keys2
[root@xxxxxxx .ssh]# chattr -a authorized_keys2
[root@xxxxxxx .ssh]# chattr -u authorized_keys2
[root@xxxxxxx .ssh]# lsattr authorized_keys2
-------------e- authorized_keys2
[root@xxxxxxx .ssh]# rm -rf authorized_keys2
[root@xxxxxxx .ssh]# ls