add --help with remove-xx script (#12585)

iotdb-core/confignode/src/assembly/resources/sbin/remove-confignode.bat

@@ -18,6 +18,18 @@
 @REM
 
 @echo off
+
+IF "%~1"=="--help" (
+    echo The script will remove a ConfigNode.
+    echo Before removing a ConfigNode, ensure that there is at least one active ConfigNode in the cluster after the removal.
+    echo Usage:
+    echo Remove the ConfigNode with confignode_id
+    echo ./sbin/remove-confignode.sh [confignode_id]
+    echo Remove the ConfigNode with address:port
+    echo ./sbin/remove-confignode.sh [cn_internal_address:cn_internal_port]
+    EXIT /B 0
+)
+
 echo ```````````````````````````
 echo Starting to remove IoTDB ConfigNode
 echo ```````````````````````````

iotdb-core/confignode/src/assembly/resources/sbin/remove-confignode.sh

@@ -18,6 +18,17 @@
 # under the License.
 #
 
+if [ "$#" -eq 1 ] && [ "$1" == "--help" ]; then
+    echo "The script will remove a ConfigNode."
+    echo "Before removing a ConfigNode, ensure that there is at least one active ConfigNode in the cluster after the removal."
+    echo "Usage:"
+    echo "Remove the ConfigNode with confignode_id"
+    echo "./sbin/remove-confignode.sh [confignode_id]"
+    echo "Remove the ConfigNode with address:port"
+    echo "./sbin/remove-confignode.sh [cn_internal_address:cn_internal_port]"
+    exit 0
+fi
+
 echo ----------------------------
 echo Starting to remove IoTDB ConfigNode
 echo ----------------------------

iotdb-core/datanode/src/assembly/resources/sbin/remove-datanode.bat

@@ -18,6 +18,18 @@
 @REM
 
 @echo off
+
+IF "%~1"=="--help" (
+    echo The script will remove a DataNode.
+    echo Before removing a DataNode, ensure that the cluster has at least the number of data/schema replicas DataNodes.
+    echo Usage:
+    echo Remove the DataNode with datanode_id
+    echo ./sbin/remove-datanode.sh [datanode_id]
+    echo Remove the DataNode with address:port
+    echo ./sbin/remove-confignode.sh [dn_rpc_address:dn_rpc_port]
+    EXIT /B 0
+)
+
 echo ````````````````````````
 echo Starting to remove a DataNode
 echo ````````````````````````

iotdb-core/datanode/src/assembly/resources/sbin/remove-datanode.sh

@@ -18,6 +18,17 @@
 # under the License.
 #
 
+if [ "$#" -eq 1 ] && [ "$1" == "--help" ]; then
+    echo "The script will remove a DataNode."
+    echo "Before removing a DataNode, ensure that the cluster has at least the number of data/schema replicas DataNodes."
+    echo "Usage:"
+    echo "Remove the DataNode with datanode_id"
+    echo "./sbin/remove-datanode.sh [datanode_id]"
+    echo "Remove the DataNode with address:port"
+    echo "./sbin/remove-confignode.sh [dn_rpc_address:dn_rpc_port]"
+    exit 0
+fi
+
 echo ---------------------
 echo "Starting to remove a DataNode"
 echo ---------------------