RFR: 8273471: Add foldmultilines to UL for stdout/err [v2]

[Yasumasa Suenaga]

On Thu, 9 Sep 2021 01:08:51 GMT, David Holmes <dholmes at openjdk.org> wrote:

>> Yasumasa Suenaga has updated the pull request incrementally with one additional commit since the last revision:
>> 
>>   Fix comments
>
> Hi Yasumasa,
> 
> Functional changes look good.
> 
> A few issues with comments and a request with the documentation change.
> 
> Thanks,
> David

@dholmes-ora Thanks for your comment! I fixed them in new commit.
We can see following help messages with `-Xlog:help` :


Available log outputs:
 stdout/stderr
 file=<filename>
  If the filename contains %p and/or %t, they will expand to the JVM's PID and startup timestamp, respectively.

Available log output options:
 foldmultilines=.. - If set to true, a log event that consists of multiple lines will be folded into a single line by replacing newline characters with the sequence '' and 'n' in the output. Existing single backslash characters will also be replaced with a sequence of two backslashes so that the conversion can be reversed. This option is safe to use with UTF-8 character encodings, but other encodings may not work.

Additional file output options:
 filesize=..       - Target byte size for log rotation (supports K/M/G suffix). If set to 0, log rotation will not trigger automatically, but can be performed manually (see the VM.log DCMD).
 filecount=..      - Number of files to keep in rotation (not counting the active file). If set to 0, log rotation is disabled. This will cause existing log files to be overwritten.

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PR: https://git.openjdk.java.net/jdk/pull/5407