User Account Configuration
Nearly every important file on a Linux system is owned by a single user and group: root. The root account is essential to the security of any Linux system. Having all of the important executable and configuration files on the system owned by root means that only the root user may alter the way the system works. Other users have no permission to execute or change system files, and therefore, they cannot modify or damage the system.
Unsurprisingly, it is critical that the root password be kept secret. A clumsy or malicious individual with the system's root password could render the entire system inoperative in a matter of seconds. Every EMAC Linux system ships from the factory with the same root password: emac_inc. EMAC recommends you change the root password after your first login. To avoid accidental damage to the filesystem, EMAC also recommends performing work while logged in as a user other than root as much as possible.
passwd utility to change the root password as illustrated below:
root@emac-oe:~# passwd Changing password for root New password: Retype password: Password for root changed by root
To change the password for a user, either login as the user and use the
passwd utility as shown above, or use the command
passwd username when logged in as root.
If desired, additional users may be added to the system. The following example demonstrates the process for creating a user named "test":
root@emac-oe:~# adduser test Changing password for test New password: Retype password: Password for test changed by root
Once all desired users are set up and secured, the network may be configured.