[SOLVED] How do I assign a string with multiple flags to a variable reusable in commands?

Issue

In a script, I have two commands with basically the same flags, and I'd like to avoid repetition.

if ...
  gcloud pubsub subscriptions create  mysub \
    --topic mytopic
    --push-endpoint="$SUBSCRIPTION_ENDPOINT" \
    --ack-deadline=$ACK_DEADLINE \
    --max-delivery-attempts=$MAX_DELIVERY_ATTEMPTS \
    --dead-letter-topic=$DEADLETTER_TOPIC \
    --min-retry-delay=$MIN_RETRY \
    --max-retry-delay=$MAX_RETRY  
else
  gcloud pubsub subscriptions update mysub
   -push-endpoint="$SUBSCRIPTION_ENDPOINT" \
    --ack-deadline=$ACK_DEADLINE \
    --max-delivery-attempts=$MAX_DELIVERY_ATTEMPTS \
    --dead-letter-topic=$DEADLETTER_TOPIC \
    --min-retry-delay=$MIN_RETRY \
    --max-retry-delay=$MAX_RETRY
fi


FLAGS="--push-endpoint=$SUBSCRIPTION_ENDPOINT \
    --ack-deadline=$ACK_DEADLINE \
    --max-delivery-attempts=$MAX_DELIVERY_ATTEMPTS \
    --dead-letter-topic=$DEADLETTER_TOPIC \
    --min-retry-delay=$MIN_RETRY \
    --max-retry-delay=$MAX_RETRY"

But in that case, this is a single string, not multiple flags. I guess I need to split the string somehow (taking into account newlines and variable replacement).

What is the simplest way to do that?

Solution

if ...; then
  COMMAND_PREFIX=(gcloud pubsub subscriptions create mysub)
else
  COMMAND_PREFIX=(gcloud pubsub subscriptions update mysub)
fi

COMMAND=(
  "${COMMAND_PREFIX[@]}"
  "--push-endpoint=$SUBSCRIPTION_ENDPOINT"
  "--ack-deadline=$ACK_DEADLINE"
  "--max-delivery-attempts=$MAX_DELIVERY_ATTEMPTS"
  "--dead-letter-topic=$DEADLETTER_TOPIC"
  "--min-retry-delay=$MIN_RETRY"
  "--max-retry-delay=$MAX_RETRY")

"${COMMAND[@]}"

Answered By - Andrej Podzimek