After executing the program, there are no hidden files

[1392273211]

[root@localhost RootKit]# ./client hide /etc/passwd
[root@localhost RootKit]# ll /etc/passwd
-rw-r--r--. 1 root root 2365 Oct 22 17:13 /etc/passwd
[root@localhost RootKit]#

[root@localhost ~]# uname -a
Linux localhost.localdomain 3.10.0-957.el7.x86_64 #1 SMP Thu Nov 8 23:39:32 UTC 2018 x86_64 x86_64 x86_64 GNU/Linux
[root@localhost ~]#

[root@localhost ~]# cat /etc/redhat-release
CentOS Linux release 7.6.1810 (Core)
[root@localhost ~]#