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• Cassandra

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  Note: Using the cqlsh as shown in README first. Help on describe command. cassandra@cqlsh> describe keyspaces; bigshoes system_auth greenspace system_traces system_schema system system_distributed Listing other objects like tables is also done with describe, see the help link for full details.
• Etcd

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  NAME: role revoke-permission - Revokes a key from a role USAGE: etcdctl role revoke-permission <role name> <key> [endkey] OPTIONS: --from-key[=false] revoke a permission of keys that are greater than or equal to the given key using byte compare --prefix[=false] revoke a prefix permission GLOBAL OPTIONS: --cacert="" verify certificates of TLS-enabled secure servers using this CA bundle --cert="" identify secure client using this TLS certificate file --command-timeout=5s timeout for short running command (excluding dial timeout) --debug[=false] enable client-side debug logging --dial-timeout=2s dial timeout for client connections -d, --discovery-srv="" domain name to query for SRV records describing cluster endpoints --endpoints=[127.0.0.1:2379] gRPC endpoints --hex[=false] print byte strings as hex encoded strings --insecure-discovery[=true] accept insecure SRV records describing cluster endpoints --insecure-skip-tls-verify[=false] skip server certificate verification --insecure-transport[=true] disable transport security for client connections --keepalive-time=2s keepalive time for client connections --keepalive-timeout=6s keepalive timeout for client connections --key="" identify secure client using this TLS key file --user="" username[:password] for authentication (prompt if password is not supplied) -w, --write-out="simple" set the output format (fields, json, protobuf, simple, table)
• MongoDB

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  Related: How do i insert a document into a collection in mongodb? How do i read a collection in mongodb? How do i update a collection on mongodb? MongoDB documentation for deleteOne: https://docs.mongodb.com/manual/reference/method/db.collection.deleteOne/ Delete a document with a specific id. > db.softwarelist.deleteOne({_id : ObjectId("5c263b8b4ef440e31fc0405f")}) { "acknowledged" : true, "deletedCount" : 1 } There are other methods that delete more than on document at a time.
• Redis

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  Redis lset command: https://redis.io/commands/lset Redis lrange command: https://redis.io/commands/lrange My entire redis list is as follows: 127.0.0.1:6379> lrange mysonglist 0 -1 1) "In my life" 2) "norwegian wood" 3) "let it be" Remember that number in redis starts from 0 (Zero). Changing number "norwegian wood" is done like this: 2nd entries is 1 counting from zero. 127.0.0.1:6379> lset mysonglist 1 "Love me do" OK 127.0.0.1:6379> lrange mysonglist 0 -1 1) "In my life" 2) "Love me do" 3) "let it be"