The ZooKeeper client provides a list of commands that allow you to access and manipulate zNodes in ZooKeeper.

You can run the command line and specify one or multiple ZooKeeper instances:
${ZK_ROOT}/bin/zkCli.sh ${ZK_ROOT}/bin/zkCli.sh -server localhost:2181 ${ZK_ROOT}/bin/zkCli.sh -server "localhost:2181,localhost:2182,localhost:2183"
You can execute directly a command as follows:
${ZK_ROOT}/bin/zkCli.sh -server localhost:2181 COMMAND ARGUMENTS

history connect host:port close quit config [-c] [-w] [-s] reconfig [-s] [-v version] [[-file path] | [-members serverID=host:port1:port2;port3[,...]*]] | [-add serverId=host:port1:port2;port3[,...]]* [-remove serverId[,...]*] ls [-s] [-w] [-R] path stat [-w] path get [-s] [-w] path getAcl [-s] path set [-s] [-v version] path data setAcl [-s] [-v version] path acl create [-s] [-e] [-c] [-t ttl] path [data] [acl] delete [-v version] path deleteall path addauth scheme auth listquota path setquota -n|-b val path delquota [-n|-b] path printwatches on|off removewatches path [-c|-d|-a] [-l] redo cmdno sync path
Notes:
▸ The command 'ls2' has been deprecated. Please use 'ls [-s] path' instead.
ls2 path [watch]
▸ The command 'rmr' has been deprecated. Please use 'deleteall' instead. rmr path

[zk: localhost:2181(CONNECTED) 2] history 0 - ls / 1 - get /abc 2 - history

[zk: localhost:2181(CONNECTED) 4] close 2016-07-10 19:24:49,241 [myid:] - INFO [main:ZooKeeper@1110] - Session: 0x100002d7e410003 closed

[zk: localhost:2181(CLOSED) 5] connect 2016-07-10 19:25:00,934 [myid:] - INFO [main:ZooKeeper@716] - Initiating client connection, connectString=localhost:2181 sessionTimeout=30000
[zk: localhost:2181(CLOSED) 5] connect localhost:2181 2016-07-10 19:25:00,934 [myid:] - INFO [main:ZooKeeper@716] - Initiating client connection, connectString=localhost:2181 sessionTimeout=30000
[zk: localhost:2181(CLOSED) 5] connect "localhost:2181,localhost:2182,localhost:2183" 2016-07-10 19:25:00,934 [myid:] - INFO [main:ZooKeeper@716] - Initiating client connection, connectString=localhost:2181 sessionTimeout=30000

[zk: localhost:2181(CONNECTED) 6] quit 2016-07-10 19:28:40,215 [myid:] - INFO [main:ZooKeeper@1110] - Session: 0x100002d7e410004 closed

Create zNode: [zk: localhost:2181,localhost:2182,localhost:2183(CONNECTED) 0] create /znode1 Created /znode1
Create zNode with data: [zk: localhost:2181,localhost:2182,localhost:2183(CONNECTED) 1] create /znode2 znode2_data Created /znode2

[zk: localhost:2181,localhost:2182,localhost:2183(CONNECTED) 1] set /znode1 znode1_data

[zk: localhost:2181,localhost:2182,localhost:2183(CONNECTED) 0] get /znode1 znode1_data

[zk: localhost:2181(CONNECTED) 0] config server.1=localhost:2888:3888:participant;0.0.0.0:2181 server.2=localhost:2889:3889:participant;0.0.0.0:2182 version=500000005

Notes:
▸ You have to enable the option "reconfigEnabled" to true in the configuration file ("zoo.cfg").
▸ You have to authenticate with an authorized user to execute the "reconfig" command (see this page zk-super-user.php for instructions on how to create an authorized user).

[zk: localhost:2181(CONNECTED) 1] reconfig -add server.3=localhost:2890:3890:participant;0.0.0.0:2183 Committed new configuration: server.1=localhost:2888:3888:participant;0.0.0.0:2181 server.2=localhost:2889:3889:participant;0.0.0.0:2182 server.3=localhost:2890:3890:participant;0.0.0.0:2183 version=600000003

Notes:
▸ You have to enable the option "reconfigEnabled" to true in the configuration file ("zoo.cfg").
▸ You have to authenticate with an authorized user to execute the "reconfig" command (see this page zk-super-user.php for instructions on how to create an authorized user).

[zk: localhost:2181(CONNECTED) 2] reconfig -remove 3 Committed new configuration: server.1=localhost:2888:3888:participant;0.0.0.0:2181 server.2=localhost:2889:3889:participant;0.0.0.0:2182 version=600000004