Linux commands part-4

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sudo - getting root permissions

ll /etc/passwd

vi /etc/passwd        - Read only file, we cannot write

sudo vi /etc/passwd   - able to write

user and group permissions for files and groups

[opc@new-k8s etc]$ ll /etc/os-release
-rw-r--r--. 1 root root 452 Sep 30  2020 /etc/os-release

Switch user

sudo su

su vignesh

su - vignesh

Create user

useradd test

Set password for user

passwd test

Verify user

cat /etc/passwd

Test user trying to install tree package

sudo yum install tree - will not work, because test user dosen’t have sudo privileges

Granting Sudo Privileges to a User

usermod -aG group_name user_name

usermod -aG wheel test

Test user trying to install tree package

sudo yum install tree - will work, because test user now have sudo privileges

Remove user from group

gpasswd -d user_name groupname

gpasswd -d test wheel

Delete the user without deleting any of their files

userdel test

Delete the user’s home directory along with the user account

userdel -r test