(B15) Linux Admin part15 User Management 3 - switch user su, suders, sudo

Published: 24 March 2022
on channel: Latif Shaik

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if a normal user , require to do a admin task

suders

user management

switch user - su

pwd
/tmp

su - -- switch to root with root user's home dir

pwd
/root

pwd
/tmp

su --switch to root user , pwd is not changing

pwd
/tmp
-----------------
pwd
/tmp

su - student1 -switch to student1 user, pwd change to student1 home dir

pwd
/home/student1

pwd
/tmp

su student2 -switch to stundent2 user, pwd not changes

pwd
/tmp
-----------------------------
[student15a@cts15l1 ~]$ useradd user5
useradd: Permission denied.
useradd: cannot lock /etc/passwd; try again later.

[student15a@cts15l1 ~]$ su -
Password:
Last login: Thu Mar 24 11:19:11 IST 2022 on :0
[root@cts15l1 ~]# less /etc/passwd
[root@cts15l1 ~]# useradd user4
[root@cts15l1 ~]# passwd user4
Changing password for user user4.
New password:
BAD PASSWORD: The password is shorter than 7 characters
Retype new password:
passwd: all authentication tokens updated successfully.

[root@cts15l1 ~]# less /etc/passwd
-----------------------------------------------
if you dont root password?
root is administrator
your not ,
how to become administrator?

how to do admin cmds by normal user?

if user is sudoer then user can run admin cmds

root:

1. add user to wheel group
id student15a

usermod -a -G wheel student15a

id student15a

2. vi /etc/sudoers
remove # before %wheel

Allows people in group wheel to run all commands
%wheel ALL=(ALL) ALL

Same thing without a password
%wheel ALL=(ALL) NOPASSWD: ALL

3.exit from user and login again

4. sudo useradd user5

sudo passwd user5

!!confirms your sudoers .....

sudo - do as super user
-like run as administrator

super user is root
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