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How to tell Bash multiple values are success?

From: Jeffrey Walton
Subject: How to tell Bash multiple values are success?
Date: Wed, 19 Jun 2019 11:01:46 -0400

Hi Everyone,

I have a systemd service that automatically applies updates. Looking
at the service history, the service reports failure when it installs
updates due to this:

    if dnf -y update &>/dev/null
        echo "Upgraded system"
        echo "Failed to upgrade system"
        exit 1

The problems seems to be 0, 100 and 200 are success. When updates are
installed either 100 or 200 is returned. Confer,
https://dnf.readthedocs.io/en/latest/command_ref.html .

I looked through Bash Variables, but I did not see a way to signal the
information to Bash. Confer,

How do I tell Bash 0, 100 and 200 are success? (Or, how to tell Bash 1
is the only failure?)

Thanks in advance

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