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https://issues.apache.org/jira/browse/ZOOKEEPER-722?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=12855859#action_12855859
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Patrick Hunt commented on ZOOKEEPER-722:
----------------------------------------

+1 Thanks Ivan!

> zkServer.sh uses sh's builtin echo on BSD, behaves incorrectly.
> ---------------------------------------------------------------
>
>                 Key: ZOOKEEPER-722
>                 URL: https://issues.apache.org/jira/browse/ZOOKEEPER-722
>             Project: Zookeeper
>          Issue Type: Bug
>          Components: scripts
>    Affects Versions: 3.3.0
>         Environment: Mac OS X
>            Reporter: Ivan Kelly
>            Assignee: Ivan Kelly
>            Priority: Minor
>             Fix For: 3.3.1, 3.4.0
>
>         Attachments: zk-722.diff
>
>
> zkServer.sh output the PID of the zookeeper process with:
> echo -n $! > "$ZOOPIDFILE"
> This uses -n which sh's builtin echo does not support. From echo's manpage.
> <snip>
>      Some shells may provide a builtin echo command which is similar or 
> identical to this utility.  Most notably, the builtin echo in sh(1) does not 
> accept
>      the -n option.  Consult the builtin(1) manual page.
> </snip>
> This means that echo -n PID > ZOOPIDFILE will mean the contents of ZOOPIDFILE 
> will be "-n PID". This stops zkServer.sh stop from working correctly.

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