Linux systemctl

systemctl is a command-line utility in Linux systems that is used to control and manage the systemd system and service manager. Systemd is a system initialization and management daemon that provides a range of features for controlling the startup, management, and monitoring of processes and services on a Linux system.

Here are some key functionalities and practical examples of using the systemctl command:

  1. Managing System Services:
  • Start a service:
    systemctl start service_name
  • Stop a service:
    systemctl stop service_name
  • Restart a service:
    systemctl restart service_name
  • Enable a service to start automatically on boot:
    systemctl enable service_name
  • Disable a service from starting automatically on boot:
    systemctl disable service_name
  • Check the status of a service:
    systemctl status service_name
  1. Managing the System:
  • Reboot the system:
    systemctl reboot
  • Shut down the system:
    systemctl poweroff
  • Hibernate the system:
    systemctl hibernate
  • Suspend the system:
    systemctl suspend
  1. Working with System Targets:
    System targets are groups of services and other units that define the system state. Common targets include for the graphical desktop environment and for the command-line interface.
  • Change the system target:
    systemctl isolate target_name
  1. Analyzing Logs:
  • View the system log messages:
    systemctl status
  • View the journal logs:
  1. Managing System Timers:
    Systemd provides a timer functionality that allows you to schedule and manage periodic tasks.
  • Start a timer:
    systemctl start timer_name
  • Stop a timer:
    systemctl stop timer_name
  • Check the status of a timer:
    systemctl status timer_name

These are just a few examples of the systemctl command’s functionalities. It provides a comprehensive interface for managing system services, targets, timers, and more. You can explore further options and features by referring to the systemctl manual page using the command man systemctl.