To Login Linux Server as a root user

Login localhost: root

Password: redhat

[root@cslit~]#                                      root user’s home directory

To Login Linux Server as  a normal user (robin):

Press: Alt + Ctrl + F2

Login localhost: robin

Password: robin’s password

[robin@cslit~]$                                     robin user’s home directory

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[root@cslit~]# adduser robin

[root@cslit~]# passwd robin

[root@cslit~]# adduser sathi

[root@cslit~]#passwd sathi

[root@cslit~]# adduser rani

[root@cslit~]#passwd rani

[root@cslit~]# adduser sumon

[root@cslit~]# passwd sumon

[root@cslit~]# cat /etc/passwd

[root@cslit~]# groupadd computer

[root@cslit~]# groupadd electronics

[root@cslit~]# groupadd civil

[root@cslit~]# cat /etc/group

[root@cslit~]# gpasswd –M robin,sumon  electronics

[root@cslit~]#gpasswd –M rani, sathi computer

[root@cslit~]# cat /etc/group

[root@cslit~]# cd /

[root@cslit /]# mkdir rhel6

[root@cslit /]# cd rhel6

[root@cslit rhel6]# mkdir computer electronics

[root@cslit rhel6]# ls

[root@cslit rhel6]# touch student

[root@cslit rhel6]# touch teachers

[root@cslit rhel6]# ls

[root@cslit rhel6]# ls  -l

[root@cslit rhel6]# cp student student_list

[root@cslit rhel6]#cp teachers teachers_list

[root@cslit rhel6]#ls

[root@cslit rhel6]# cp /etc/passwd  /rhel6

[root@cslit rhel6]# ls

[root@cslit rhel6]# cat  passwd

[root@cslit rhel6]# cat /etc/passwd

[root@cslit rhel6]# mv passwd userlist

[root@cslit rhel6]# ls

[root@cslit rhel6]# ls –l

[root@cslit rhel6]#cd computer

[root@cslit computer]# pwd

[root@cslit computer]#cd ..

[root@cslit rhel6]# cd –

[root@cslit computer]# cd /

[root@cslit /]# cd

[root@cslit ~]# cat /etc/passwd

  Robin   :x:  500:500:student :/home/robin:/bin/bash

 

Username  Password  UID   GID  comment       user’s home directory    user’s shell

[root@cslit ~]#

Alt + Ctrl + F1 = Graphics Terminal (GUI)

Alt + Ctrl + F2 - Alt + Ctrl + F7 = Command Terminal

[root@cslit ~]# hostname

Cslit

[root@cslit ~]#hostname server

[root@cslit ~]#hostname

Server

[root@cslit ~]# tty

[root@cslit ~]# who

[root@cslit ~]#w

[root@cslit ~]#whoami

[root@cslit ~]# cd /home

[root@cslit home]# ls

[root@cslit home]#userdel robin

[root@cslit home]# ls

[root@cslit home]# cat /etc/passwd

[root@cslit home]# userdel –r sumon

[root@cslit home]# ls

[root@cslit home]# cat /etc/passwd

[root@cslit home]# groupdel computer

[root@cslit home]# cat /etc/group

[root@cslit ~]# cd /rhel6

[root@cslit rhel6]#ls

[root@cslit rhel6]# cp userlist computer

[root@cslit rhel6]# rmdir electronics   (for empty directory)

[root@cslit rhel6]# rm –r  electronics (directory contain + questions)

[root@cslit rhel6]# rm –rf electronics (directory contain without question)

[root@cslit rhel6]# rm userlist (file delete with question)

[root@cslit rhel6]#  rm –f userlist (file delete without questions, forcely)

[root@cslit rhel6]# rm –rf  * (delete all files and directories from current location)

[root@cslit rhel6]# init 0 (shutdown)

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