etcdctl: command not found

[Bhavesh Joshi]

Hi I am using etcd version as follows

{"etcdserver":"3.2.7","etcdcluster":"3.2.0"}

I need to get the version history of the key but for me only curl command are working if I do 

etcdctl get --prefix --rev=4 foo

I get:

-bash: etcdctl: command not found

I am able to run the etcdctl with v2 but with v3 I am getting this error.