If this is just a process, not a service, you can do something like
$ ps auwx | grep cassandra $ sudo kill <pid>
where <pid> is what you get from ps auwx | grep cassandra ps auwx | grep cassandra
This will stop the process. Then you need to run it again
$ cd <install_location> $ bin/cassandra
where <install_location> is where you installed cassandra
if it is a service: service cassandra restart
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