RESTRICT USERS TO USE OLD PASSWORDS

Restrict Users to Use Old Passwords This is very useful if you want to disallow users to use same old passwords. The old password file is located at /etc/security/opasswd. This can be achieved by using PAM module. [root@localhost ~]# cat /etc/pam.d/system-auth #%PAM-1.0 # This file is auto-generated. # User changes will be destroyed the next …

user&group administration

User and Group Administration To add a new user account, you can run either of the following two commands as root. adduser tom useradd jerry [root@machine1 ~]# cat /etc/passwd | grep tom tom:x:501:501::/home/tom:/bin/bash [root@machine1 ~]# cat /etc/passwd | grep jerry jerry:x:502:502::/home/jerry:/bin/bash ----------------------------------------------------------------------------------------------------------------------- View a List of All Groups To view all the groups on the …