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bin/kafka-configs.sh --bootstrap-server localhost:9092 \
  --entity-type brokers --entity-default \
  --alter --add-config-file new.properties

bin/kafka-configs.sh --bootstrap-server localhost:9092 \
  --entity-type brokers --entity-default \
  --alter --add-config 'k1={"key1":"val1","key2":"val2"},k2=[[1,2],[3,4]]'

bin/kafka-configs.sh --bootstrap-server localhost:9092 \
  --entity-type brokers --entity-default \
  --alter \
  --add-config k1=v1 \
  --add-config k2=v1,v2,v3 \
  --add-config k3=v3 \
  --add-config 'k4={"key1": "val1", "key2": "val2"}' \
  --add-config 'k5=[[1,2],[3,4]]'

Input from STDIN can be used instead of a file on disk, to do this use a hyphen instead of a file path:

grep 'complex.property' server.properties | bin/kafka-configs.sh --bootstrap-server localhost:9092 \
  --entity-type brokers --entity-default \
  --alter --add-config-file -

So that the add and delete usages are parallel, we will also add an option to accept a properties file and delete the properties from the file. Any property defined in the file will be deleted, regardless of what value is defined in the file.

bin/kafka-configs.sh --bootstrap-server localhost:9092 \
  --entity-type brokers --entity-default \
  --alter --delete-config-file old.properties

Input from STDIN can be used instead of a file on disk, to do this use a hyphen instead of a file path:

grep 'complex.property' server.properties | bin/kafka-configs.sh --bootstrap-server localhost:9092 \
  --entity-type brokers --entity-default \
  --alter --delete-config-file -

...

We will add the --delete-config-file option to kafka-configs.sh. It will not be mutually exclusive with --delete-config because there is no ambiguity about precedence.