User`s manual

DA-660-8/16-CE User’s Manual Getting Started
User/Group Management
User Group: You often want the target computer to be accessible by multiple users with different
needs. For example, a specific service, such as ftp or telnet, is accessible only by the users within
the permissible group. By default, three user groups, namely ftpd, telnetd, and administrators are
pre-created for your convenience.
Adding a Group: Use the command useradd –g <groupName> to create a user group.
\> useradd –g yyyy
group yyyy has been added.
Deleting a Group: To remove a group, use the command userdel –g <groupName>.
\> userdel –g yyyy
group yyyy has been removed.
Adding a User: Use the command useradd <newUserID> to add a user for accessing the system.
The user’s password, by default, is the same as the user name.
\> useradd xxxx
user xxxx has been added.
In addition, you can permit this user to access a particular service by typing -g followed by the user
group name of the service, i.e., useradd –g <groupName> <newUserID>. For example,
\> useradd –g telnetd xxxx
user xxxx is existent
group telnetd is existent
user xxxx has been added to group yyyy
Deleting a User: Use the command userdel <userID> to delete a user from the system. User
“admin” CANNOT be deleted.
\> userdel xxxx
user xxxx has been deleted
You can also just remove a user from a user group by using the command userdel –g
<groupName> <newUserID>. For example,
\> userdel –g yyyy xxxx
user xxxx has been removed from group yyyy
Changing the Password: Use the command “passwd <userID>” to change your login password.
The user’s password, by default, is the same as the user name.
\> passwd xxxx
Current password:
New password:
Retype new password:
Password has been changed
2-4