zk经常使用，但是也经常忘记这些指令，稍微记录一下。
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// Create Znodes
create /path /data
e.g. create /FirstZnode “Myfirstzookeeper-app”
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// Get Data : It returns the associated data of the znode and metadata of the specified znode
get /path
e.g. get /FirstZnode
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// Set Data : Set the data of the specified znode
set /path /data
e.g. get /SecondZnode "Data-updated"
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// Watch : Watches show a notification when the specified znode or znode’s children data changes
get /path [watch] 1
e.g. get /FirstZnode 1
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// List Children
ls /path
e.g. ls /MyFirstZnode
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