Services and process management

PS command

• ps aux - display all running services (snapshot) ex. ps aux | grep "ssh"
• sudo kill <pid> - kill process with provided pid, provided by ps command
• pkill <process-name> - kill process by name :sunglasses:

OG COMMAND -> ps -auxf (tree structure)

Systemd (Ubuntu/Debian)

• systemctl | grep <service_name> - display all running services or grep one
• sudo systemctl is-enabled ssh - check if service is enabled
• systemctl list-unit-files --type=service --state=enabled - list all enabled services
• sudo systemctl enable --now ssh - Enable and start service
• sudo systemctl disable --now ssh - Disable and stop service
• sudo systemctl status ssh - check status of service
• sudo systemctl start ssh - start service
• sudo systemctl stop ssh - stop service
• systemctl --failed --type=service - list failed services
• systemctl list-units --type=service - list all running services
• systemctl list-units --type=service --state=inactive - list all inactive services
• systemctl list-units --type=service --all - list all services

RedHat/CentOS

• chkconfig --list - list all services
• chkconfig --list | grep ssh - list service by name
• chkconfig sshd on - enable service
• chkconfig sshd off - disable service
• service sshd status - check status of service
• service sshd start - start service
• service sshd stop - stop service
• service sshd restart - restart service
• service sshd reload - reload service
• service sshd condrestart - restart service if it is already running
• service sshd try-restart - restart service if it is already running
• service sshd force-reload - force reload service