How to delete unused old versions of lambda function ?

 aws lambda --profile dev list-versions-by-function --function-name AssessmentSessionServiceDevWavedevAssessmentSessionServiceLambda \

| jq -r '.Versions[] | select(.Version!= "$LATEST") |.Version' \

| head -n 70 \

| xargs -I {} aws lambda delete-function --function-name AssessmentSessionServiceDevWavedevAssessmentSessionServiceLambda:{} --profile dev