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Date: Mon, 12 Sep 2016 09:46:20 +0000 (UTC)
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Subject: [jira] [Commented] (KARAF-4376) Make grep return the list of
 results rather than null
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archived-at: Mon, 12 Sep 2016 09:46:22 -0000


    [ https://issues.apache.org/jira/browse/KARAF-4376?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=15483662#comment-15483662 ] 

ASF GitHub Bot commented on KARAF-4376:
---------------------------------------

Github user avdyk closed the pull request at:

    https://github.com/apache/karaf/pull/175


> Make grep return the list of results rather than null
> -----------------------------------------------------
>
>                 Key: KARAF-4376
>                 URL: https://issues.apache.org/jira/browse/KARAF-4376
>             Project: Karaf
>          Issue Type: Improvement
>          Components: karaf-shell
>            Reporter: Jim Sermersheim
>            Assignee: Guillaume Nodet
>             Fix For: 4.1.0
>
>
> It seems natural to run 'each' over the result of grep, but this causes a NullPointerException. I suppose because GrepAction.execute() returns null rather than list (the ArrayList holding the filtered results).
> For example:
> {noformat}
> > a = [ben bart pen]
> ben
> bart
> pen
> > echo $a
> [ben, bart, pen]
> > b = ($a | grep en)
> ben
> pen
> > each ($b) { echo $it }
> Error: java.lang.NullPointerException
> > echo $b
> Error: java.lang.NullPointerException
> > echo ($a size)
> 3
> > echo ($b size)
> Error: Command name evaluates to null: $b
> {noformat}


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