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https://issues.apache.org/jira/browse/LOG4J2-1013?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=16396377#comment-16396377
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Fernando Díaz commented on LOG4J2-1013:
---------------------------------------

See 
[https://github.com/apache/logging-log4j2/pull/159|https://github.com/apache/logging-log4j2/pull/159]

Using that branch, if I run 
{{org.apache.logging.log4j.core.lookup.MainInputArgumentsLookupTest}} with the 
command line {{--file foo.txt}} and the following pattern layout:

{code}
%d [%t] [${main:1}][${main:-1}][${main:--file}][${main:bad:-${main:--file}}] 
%-5level: %msg%n%throwable
{code}

The output is:

{code}
2018-03-13 02:23:40,824 [main] [foo.txt][1][foo.txt][foo.txt] ERROR: this is an 
error message
{code}

Taking a look at other tests, in particular in {{StrSubstitutorTest}}, I think 
the output {{[1]}} is correct because {{main}} is the key in that particular 
case.

I've included some unit tests. All test pass.

> Log4j2 Main Arguments Lookup by name doesn't work
> -------------------------------------------------
>
>                 Key: LOG4J2-1013
>                 URL: https://issues.apache.org/jira/browse/LOG4J2-1013
>             Project: Log4j 2
>          Issue Type: Bug
>          Components: API, Core, Lookups
>    Affects Versions: 2.2
>         Environment: Windows 7 x64 Ultimate and Java 8U31 x64. Project 
> created using Eclipse.
>            Reporter: Ioan Mihaila
>            Priority: Critical
>         Attachments: 
> LOG4J2_1013_select_underlying_StrLookup_before_stripping_off_potential_default_values.patch
>
>
> Accessing Main Arguments by using index based look up works : $\{main:0}
> Accessing Main Arguments by using name based look up doesn't work : 
> $\{main:--file}
> When trying to access by name it doesn't retrieve the argument but retrieves 
> "-file".



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