Unable to use graql on commandline

So I am using grakn core 1.5.7 on Ubuntu 18.04.

I want to use graql command.With older versions of grakn it was quite good to have a graql executable available.Here is the command i am using from inside my grakn folder.

graql console --keyspace prec --file ./schema.gql

However in newer versions on and after 1.5.7,I cannot find the same.

I had a look on the bugs section of grakn and i found this to be close but not much related issue. Following which i tried replacing graql to grakn but now i am getting this error

io.grpc.StatusRuntimeException: UNIMPLEMENTED: Method not found: session.SessionService/open
    at io.grpc.stub.ClientCalls.toStatusRuntimeException(ClientCalls.java:233)
    at io.grpc.stub.ClientCalls.getUnchecked(ClientCalls.java:214)
    at io.grpc.stub.ClientCalls.blockingUnaryCall(ClientCalls.java:139)
    at grakn.protocol.session.SessionServiceGrpc$SessionServiceBlockingStub.open(SessionServiceGrpc.java:273)
    at grakn.client.GraknClient$Session.<init>(GraknClient.java:165)
    at grakn.client.GraknClient$Session.<init>(GraknClient.java:136)
    at grakn.client.GraknClient.session(GraknClient.java:123)
    at grakn.core.console.ConsoleSession.<init>(ConsoleSession.java:90)
    at grakn.core.console.GraknConsole.run(GraknConsole.java:99)
    at grakn.core.console.GraknConsole.main(GraknConsole.java:140)

Cannot understand what is the resolution for the same

Solution

So Thanks to help by grakn team , I resolved the issue by doing the following steps:

replace graql with grakn (for versions 1.5 and above)
stop grakn server by ./grakn server stop
run jps on commandline to identify if there are any processes still running for the grakn server
use the process id from step 3 and kill those processes by kill -9
Now do grakn server start
now run your grakn console commands, they will work.