SSH :
SSH or Secure shell, is a known protocol used for connecting to server remotely, in RHCSAv8 you just have to learn how to connect from server to server. below you will find the command syntax :
systemctl enable --now sshd -> to enable the sshd service.
ssh <user_name>@<ipaddress/host_name>
vim /etc/ssh/sshd_config -> configuration file for ssh.
Host key is stored in ~/.ssh/known_hosts
Sensitive data will be sent through an encrypted connection.
SCP :
SCP (secure copy) is a command-line utility that allows you to securely copy files and directories between two locations. Below you will find the right command to do that :
scp <file_name> username@<ip_adress>:/remote/directory
chvt :
chvt - change foreground virtual terminal, The command chvt N makes /dev/ttyN the foreground terminal.
chvt 4 -> change the virtual terminal to tty4.
or you can change the virtual terminal directly through your keyboard by clicking on
ctrl + alt + F(1-2-3-4-5-6)
su :
su - switch user, another powerful command used to switch from user to user.
su - chxmxii -> to switch from the current user to chxmxii
su - -> to switch from the current user to the root user.
the "-" will take you to the home directory of the user. you are free to use it or not.
sudo :
sudo - super user do, use this command to execute tasks with root power.
sudo userdel user1 -> normal user cannot run this command without using sudo as only root can add and delete users.
to allow users running commands as root you need either to :
vim /etc/sudoers or visudo and add the user <username> under #allow root to run any commands anywhere
phew, we are done now lets move to the next chapter.
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