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https://issues.apache.org/jira/browse/ZOOKEEPER-1089?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=13047375#comment-13047375
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Patrick Hunt commented on ZOOKEEPER-1089:
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Is there an idiom for detecting which options a command line supports? Coding
linux versions into the script seems like a bad idea longer term, perhaps we
can try to run using nc, and if that fails retry using /dev/tcp? (or perhaps
first try to run something using "nc -q" that shouldn't fail as long as nc
supports -q, and then either use it or /dev/tcp depending on the results?)
> zkServer.sh status does not work due to invalid option of nc
> ------------------------------------------------------------
>
> Key: ZOOKEEPER-1089
> URL: https://issues.apache.org/jira/browse/ZOOKEEPER-1089
> Project: ZooKeeper
> Issue Type: Bug
> Components: scripts
> Affects Versions: 3.4.0
> Reporter: Bill Au
>
> The nc command used by zkServer.sh does not have the "-q" option on some
> linux versions ( I have checked RedHat/Fedora and FreeBSD).
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