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