AksTester's questions

I execute the command sudo cassandra -R to start cassandra and I get the following error.

getopt: invalid option -- 'R'
/usr/sbin/cassandra: 158: exec: java: not found

It points to the following line in the cassandra script.

else
        exec $NUMACTL "$JAVA" $JVM_OPTS $cassandra_parms -cp "$CLASSPATH"

Is it because the environment variable JAVA is not set? If yes, how to set the variable?

The output of echo $JAVA_HOME is blank. This is the output of java -version:

java version "1.8.0_161"
Java(TM) SE Runtime Environment (build 1.8.0_161-b12)
Java HotSpot(TM) 64-Bit Server VM (build 25.161-b12, mixed mode)

My command is

echo "deb http://www.apache.org/dist/cassandra/debian 311x main" | sudo tee -a /etc/apt/sources.list.d/cassandra.sources.list

I want to pass my password user-password as an argument in the above command similar to the one shown below:

echo user-password | sudo -S apt-get update

My issue is that i don't know how to pass both the URL as well as the sudo password simultaneously.

Also i am ensuring that the password is not visible on the terminal as this command will be called by a python script which reads the password from a file (or from user)