CentOS

Can I use CentOS 6 commands on CentOS 7?
For example:

service nginx restart

Some of the "old commands" are mere wrappers for "new commands", but I would not rely on that.

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# service nginx status
Redirecting to /bin/systemctl status nginx.service
...

Your example, nginx, is in EPEL repository and the version for el7 has been configured to be a systemd service. Therefore, the "native" command is:

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# systemctl restart nginx

The upstream (RHEL-7) has extensive documentation. Use it. If you are not in a hurry, then focus on RHEL-8 for CentOS 8 is within feasible(*) future.

(*) Assessment ignores likelihood of global warming killing all humans.

CentOS

The command on CentOS 7

The command on CentOS 7

Re: The command on CentOS 7