Introduction
Linux is an open-source operating system that is widely used in servers, supercomputers, and embedded devices. As a Linux administrator, you will be responsible for managing and maintaining these systems to ensure optimal performance and security.
Basic Linux Commands
ls
– list files and directoriescd
– change directorymkdir
– create a new directoryrm
– remove files and directoriescp
– copy filesmv
– move or rename files
User Management
As a Linux administrator, you will need to create and manage user accounts. You can use the useradd
command to create new users and set their password.
sudo useradd -m -s /bin/bash myuser
The -m
option creates the user’s home directory and sets the default shell to /bin/bash
. You can also set other options such as the user’s group membership and password expiration.
File System Management
Linux has a powerful file system that allows you to manage files and directories using various commands. You can use the mkdir
command to create new directories, and the rm
command to remove files and directories.
sudo mkdir /my/new/directory
You can also use the cp
command to copy files and directories, and the mv
command to move or rename files.
Networking and Security
As a Linux administrator, you will need to ensure that your system is secure and protected from unauthorized access. You can use various networking and security tools such as firewall-cmd
and fail2ban
to configure your firewall and protect against brute force attacks.
sudo firewall-cmd --permanent --add-rule ipv4 input ssh
You can also use the selinux
command to enable or disable SELinux, and the chroot
command to change your root directory.