monitoring cassandra using nodetool cause -bash: nodetool: command not found

[rohanjangid]

hii folks 

i want to monitor cassandra through cli for that we have an option is nodetool

so i run this command

also set JMX authentication but as soon i hit this command on /opt/apigee/apigee-cassandra/bin directory  "

nodetool [-u username -pw password] -h localhost ring

it said nodetool command not found 

how can i use nodetool command 

any guide / suggestion would be really helpful