With the Oracle Critical Patch Update Advisory – July 2023 – you may have spotted a change in the Database Release Update READMEs: You may need to run root.sh again after RU patching. Why is that?

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Let us have a quick look
I verified this with the 19.20.0 README on Linux. But I guess this applies to the other READMEs as well. Please bare in mind that this applies to the Database RUs only, not to Grid Infrastructure. You can find this new paragraph in it:
… Continue reading...3.3.5 Update Permissions for extjob