1 – SYSTEM INFORMATION
    2 – HARDWARE INFORMATION
    3 – PERFORMANCE MONITORING AND STATISTICS
    4 – USER INFORMATION AND MANAGEMENT
    5 – FILE AND DIRECTORY COMMANDS
    6 – PROCESS MANAGEMENT
    7 – FILE PERMISSIONS
    8 – NETWORKING
    9 – ARCHIVES (TAR FILES)
    10 – INSTALLING PACKAGES
    11 – SEARCH
    12 – SSH LOGINS
    13 – FILE TRANSFERS
    14 – DISK USAGE
    15 – DIRECTORY NAVIGATION