Introducing HBase Shell Commands

This section describes common HBase shell commands.

Start the HBase shell.
Go to the HBase directory and run the following command to access the HBase shell:
```
./bin/hbase shell
```
Get help information.
After you run the help command in the HBase shell, all command information as well as common command instructions and use methods will be returned.
```
hbase(main):001:0> help
```
Create a table.
Run the create command to create a table. When creating a table, you must specify the table name and column family name.
```
hbase(main):007:0> create 'cloudtable','cf'
0 row(s) in 1.5530 seconds

=> Hbase::Table - cloudtable
```

Query a table:

hbase(main):009:0> list
TABLE
cloudtable
1 row(s) in 0.0060 seconds

=> ["cloudtable"]

Insert a piece of record to a table.
Run the put command to insert a piece of record to the specified table. You need to specify the table name, primary key, customized column, and inserted value.
```
hbase(main):004:0> put 'cloudtable','row1','cf:a','value1'
0 row(s) in 0.2720 seconds
```
The following describes parameters in the command:
- cloudtable: table name
- row1: primary key
- cf:a: customized column
- value1: inserted value
Scan records
Run the scan command to scan a table. You need to specify the table name and you can scan a full table or specify a scanning range.
```
hbase(main):001:0> scan 'cloudtable'
ROW                                                                  COLUMN+CELL
row1                                                                column=cf:a, timestamp=1504866237162, value=value1
1 row(s) in 0.2420 seconds
```
- If the TTL of the cell is set when the data is inserted, the TTL attribute cannot be viewed. You can check whether the TTL configuration is successful.
- If the TTL of the cell is not set when data is inserted, the system automatically inserts the current time as the timestamp.

Query a single record.

Run the get command to query a single record. The name and primary key of the queried table must be specified.

hbase(main):001:0> get 'cloudtable','row1'
COLUMN                                                               CELL
cf:a                                                                timestamp=1504866237162, value=value1
1 row(s) in 0.2280 seconds

Disable a table.
Before modifying or deleting a table, you need to disable the table. Run the disable command to disable the table. When you perform operations on a disabled table, "ERROR" will be reported, indicating that the table is disabled.
```
hbase(main):002:0> disable 'cloudtable'
0 row(s) in 2.3550 seconds
```
Enable a table.
If you want to use a table that has been disabled, run the enable command to enable the table.
```
hbase(main):004:0> enable 'cloudtable'
0 row(s) in 1.2500 seconds
```
Delete a table.
Run the drop command to delete a table that you do not require anymore. Before deleting a table, disable the table. Otherwise, "ERROR" will be displayed, indicating that the table is enabled. Deleting a table will cause data loss. Therefore, exercise caution when deleting a table.
```
hbase(main):007:0> disable 'cloudtable'
0 row(s) in 2.2380 seconds

hbase(main):008:0> drop 'cloudtable'
0 row(s) in 1.2600 seconds
```
Exit the HBase shell.
Run the quit command to exit the HBase shell.
```
hbase(main):009:0> quit
```