RFR: 8301197: Make sure use of printf is correct and actually needed [v3]

[Magnus Ihse Bursie]

On Mon, 7 Apr 2025 05:25:39 GMT, David Holmes <dholmes at openjdk.org> wrote:

>> No, there are embedded `\n` and that does not work with echo. I could split it into three consecutive lines but I don't think that would be a gain.
>
> Ah I see. So basically the only time we actually need `printf` as far as I can see is when there are embedded newlines in the output string? We could have used `printf` without `%s` format specifiers whenever we are substituting a variable.

Yes, that, or that we need additional formatting, such as "%22s" where we want to align certain fields. Embedded `\n` can in theory be replaced with multiple calls to echo, but in the end it is a matter of judgement which is to prefer.

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PR Review Comment: https://git.openjdk.org/jdk/pull/24415#discussion_r2030895994