3 Basic Commands and Simple Shell Scripts Once you have your first Red Hat Enterprise Linux rhel

[root@rhel-instance ]# grep user /etc/passwd

Download 1.85 Mb.

View original pdf

Page	54/67
Date	26.02.2024
Size	1.85 Mb.
	#63678

1 ... 50 51 52 53 54 55 56 57 ... 67

Pablo Iranzo Gómez, Pedro Ibáñez Requena, Miguel Pérez Colino, Scott McCarty - Red Hat Enterprise Linux 9 Administration-Packt Publishing (2022) -chap 3 82 - 180

[root@rhel-instance ] useradd --uid 1002 -groups wheel \ --comment "User 02" --home-dir /home/user02 \ --shell /bin/bash user02
[root@rhel-instance ] groupadd finance [root@rhel-instance ] grep finance /etc/group finance:x:1003
[root@rhel-instance ] userdel user01 [root@rhel-instance ] grep user /etc/passwd [root@rhel-instance ] id user01 id: user no such user

[root@rhel-instance
]# grep user /etc/passwd
user01:x:1001:1001:User 01:/home/user01:/bin/bash
The usermod command uses the same options as useradd. It will be easy to customize your current users now.
Let’s create user as an example of how to use the options:
[root@rhel-instance
]# useradd --uid 1002 -groups wheel \
--comment "User 02" --home-dir /home/user02 \
--shell /bin/bash user02
[root@rhel-instance
]# grep user /etc/passwd
user02:x:1002:1002:User 02:/home/user02:/bin/bash
[root@rhel-instance
]# id user02
uid=1002(user02) gid=1002(user02) groups=1002(user02),10(wheel)
Tip
When the command line is too long, the \ character can be added, then press Enter and continue the command on anew line.
Now, we know how to create a user, but we may need to create a group too and add our users to it. Lets create the finance group with the groupadd command:
[root@rhel-instance
]# groupadd finance
[root@rhel-instance
]# grep finance /etc/group
finance:x:1003:
We can add the user and user users to the finance group:
[root@rhel-instance
]# usermod -aG finance user01
[root@rhel-instance
]# usermod -aG finance user02
[root@rhel-instance
]# grep finance /etc/group
finance:x:1003:user01,user02

Creating, modifying, and deleting local user accounts and groups
141
Important Note
We are using the -aG option to add the user to the group, instead of modifying the groups the user belongs to.
Once we know how to create users and groups, let’s check how to delete them with the userdel command:
[root@rhel-instance
]# userdel user01
[root@rhel-instance
]# grep user /etc/passwd
[root@rhel-instance
]# id user01
id: 'user no such user

Download 1.85 Mb.

Share with your friends:

1 ... 50 51 52 53 54 55 56 57 ... 67