Basics

Documentation
Downloading and Archiving Files
Finding Files
grep
cron
Processes
Ulimit
Logging
File Manipulation
Users & Groups
Permissions
Access Control Lists (ACL)
Package Management
Swap
Git
Basic Scripting

Containers and Virtualization

Linux Containers (LXC)
Docker
Kernel-based Virtual Machine (KVM)

Networking

Routing
Domain Name Servers (DNS)
Firewall
Web Servers
Secure Shell (SSH)
Network File System (NFS) and Samba (SMB)
File Transfer Protocol (FTP)
Email
Time servers
Single Sign On (SSO)
Network Scripting

Storage

Rsync
fstab
Disk Quotas
fdisk and mkfs
Logical Volume Management (LVM)
Redundant Array of Independent Disks (RAID)
Linux Unified Key Setup (LUKS)
Storage Scripting

Booting and Deep System

Grand Unified Boot Loader (GRUB)
Systemd
Kernel Runtime Parameters
AppArmor

Community

Github
Copyright

Linux Sysadmin Test Prep

Secure Shell (SSH)

Secure Shell (SSH)

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Network File System (NFS) and Samba (SMB)