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https://issues.apache.org/jira/browse/LOG4J2-382?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=15030500#comment-15030500
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Paul Nyheim commented on LOG4J2-382:
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The level/p is a special case - as it is possible to set the length property.
So in your case, the {{%-1}} modifier actually has no effect - as length
already has it truncated down to 1 character.
Now for the more generic use-case for any conversion pattern, truncating from
the end was fixed in v2.3 in LOG4J2-926.
So to achieve the same with this modifier, one could write {{%.-1level}}
See documentation of format modifiers after the table of conversion patterns
here. http://logging.apache.org/log4j/2.x/manual/layouts.html#PatternLayout
This issue should be closed as duplicate.
> PatternLayout: truncating from the end
> --------------------------------------
>
> Key: LOG4J2-382
> URL: https://issues.apache.org/jira/browse/LOG4J2-382
> Project: Log4j 2
> Issue Type: Improvement
> Components: Layouts
> Reporter: Alexey Pomelov
>
> The first case I've met: I'd like to print only first letter of the log
> record priority. %1.1p leads to R,N,O,G,E letters (not very friendly).
> For example it will be nice to specify a negative number after dot and
> truncate token from the end.
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