Page 32 - RHEL8 BOOK

User Administrator

 In computing, a user is a person who uses a computer’s objects resources or internet service.
 A user will have a user account that identifies the user by a username. The username can be
recognizing even with the uid.
 To log on to a system, a user is required to authenticate himself with a password for the purpose of
accounting, security, logging and resource management.
 Unix/Linux is multi user and multi tasking OS
 Redhat Linux uses User Private Group (UPG)

 Scheme: -
 User always get created with primary group
 One Primary Group per User
 We create the user account the user automatically creates own group with same
name.
 When a user is created in Linux: --
 home directory (/home/username)
 mail account (/var/spool/mail/username)
Note: mail accounts can be use if mail server is working.
 unique UID & GID

Types of Users

System Users Normal Users
UID 0-999 UID 1000-60000

 O.S can understand user accounts with ID values, can’t identified with names.
 The ID value assign to the user the ID called UId and ID assign to the group then the ID value called
GID.
 The user’s home directory default created at “/home” directory and their mail account created at
“/var/spool/mail” location.

In Linux 2 types users and groups are available
1. Primary User
2. Secondary User
3. Primary Group
4. Secondary Group

S. Pradhan
(MCA, MBA-IT, BCA, CCNA, MCSA 2012, RHCE, ETHICAL HACKING)
Email Id:-spradhan.iiht@gmail.com
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