When using any Linux distribution, several processes and services will run together. Some services may run in the background without the user's knowledge. Running unnecessary services can consume a lot of system resources or cause security problems.
Therefore, it is necessary to know all the services that are running on the system. In this article, TipsMake.com will show you all possible ways to list the services running on Linux computers.
How to check the services running in Linux
First, understand the Linux services. If the service has a script, then it comes with three states:
This is all done with the - service command . For example, to restart service network-manager, run the following command:
sudo service network-manager restart
The service command references each service using the init script stored in /etc/init.d for Ubuntu and any other Debian-based distributions, and etc / rc.d / init.d for the distributions. Linux distribution is based on RedHat. Some service names vary by distribution. For example, the Apache web server service is httpd on CentOS and Apache2 on Ubuntu.
Many Linux distributions belong to the following init systems:
Check all services running in the System V (SysV) init system
Let's take a look at some of the Terminal commands you can use to list all services running on the SysV init system.
service --status-all
Service -status-all command outputThe above command lists all the services running in the system. In case the service is running a lot, you can use the additional parameters - more and less to list the services in the view in an organized and clear manner.
service --status-all | less
Service command output –status-all | Lessservice --status-all | more
Service command output –status-all | MoreTo list only services currently running on the system, execute the command below:
service --status-all | grep running
To view the status of a specific service, execute the command below:
service --status-all | grep [service_name] e.g service --status-all | grep httpd
Alternatively, you can execute the below command to view the status of a specific service.
service httpd status
To list all services that are activated during boot, execute the command below:
chkconfig --list
Check all services running in the Upstart init system
To list all services on Linux machines running the Upstart init system, execute the command below:
initctl list
Check all the services running in the Systemd init system
To list all services on Linux machines running Systemd init, execute the following command:
systemctl
Systemctl command outputFrom the above command, we see that the data is displayed in 5 columns, namely UNIT, LOAD, ACTIVE, SUB and DESCRIPTION .
You can also list running services based on their type with the following command:
systemctl list-units --type service
Output command systemctl list-units –typeYou can also list services based on their current state. The result is quite similar to the output of the previous command but a bit simpler.
systemctl list-unit-files --type service
systemctl list-unit-files | grep enabledTo list the status of a specific service, execute the command below:
systemctl status [service_name] e.g systemctl status acpid.path
Systemctl status acpid.path commandTo list only services currently running on the system, execute the command below:
systemctl | grep running
The systemctl command | grep runningTo list all services that are activated during boot, execute the command below:
systemctl list-unit-files | grep enabled
The command systemctl list-unit-files | grep enabledYou can also view the top control groups and their use of system resources such as I / O, CPU, Tasks and Memory using the systemd-cgtop command .
systemd-cgtop
Systemd-cgtop command outputIt is also possible to use pstree to list all services running on the system. Pstree gets this information from the Systemd system output.
pstree
Pstree command outputPstree can also be used with the System V int system. It takes the output from the SysVinit system.
pstree
You can also use the chkservice utility to check all the services running on the Systemd system. This utility is not preinstalled. However, you can install it via Terminal using the command below:
sudo apt-get install chkservice
Chkservice installation commandTo start the chkservice, execute the command below. Note, you need superuser rights.
sudo chkservice
The command starts chkserviceTo see all the features that come with this great tool, press the key ?
to open the Help menu .
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