[jira] [Commented] (KARAF-2378) Shell:exec doesn't show output for commands that execute too quickly

["Freeman Fang (JIRA)" <ji...@apache.org>]

    [ https://issues.apache.org/jira/browse/KARAF-2378?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=13702965#comment-13702965 ] 

Freeman Fang commented on KARAF-2378:
-------------------------------------

yeah, this is caused by external process done to soon before pump thread get chance to pump the stream
                
> Shell:exec doesn't show output for commands that execute too quickly
> --------------------------------------------------------------------
>
>                 Key: KARAF-2378
>                 URL: https://issues.apache.org/jira/browse/KARAF-2378
>             Project: Karaf
>          Issue Type: Bug
>          Components: karaf-shell
>    Affects Versions: 3.0.0.RC1
>         Environment: Ubuntu 13.04, jdk 7
>            Reporter: Christophe Vanfleteren
>            Assignee: Freeman Fang
>
> When using shell:exec, you don't see any output when the command you're executing is executing too fast.
> {code}
> karaf@root()> shell:exec ls
> bin
> data
> demos
> deploy
> etc
> instances
> lib
> LICENSE
> lock
> NOTICE
> README
> RELEASE-NOTES
> system
> karaf@root()> shell:exec ls
> karaf@root()> 
> {code}
> For example, using shell:exec ls doesn't return anything, but shell:exec du / does.
> Although, almost every time you first use shell:exec, you do get output on the console. If I add a Thread.sleep right before the p.waitFor in, it also consistently works.
> The cause must be related to the PumpStreamHandler.

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