How do I put comment on each line in bash for printf?

Question

I have the following code in my Dockerfile. Then I piped the output to my setup.py. I need to run this command in linux terminal. How can i put comment on each line?

  printf "%s\n" \
    # Facebook OAuth Client ID (default)
    "1234" \
    # Facebook OAuth Secret (default)
    "abcd" \
    # Google OAuth Client ID (default)
    "5678" \
    # Google OAuth Secret (default)
    "qwer" \

Answer 1

Using arrays in order to avoid long escaped by \ lists of arguments is a good practice. You can leave a comment for each element.

CREDENTIALS=(
    # Facebook OAuth Client ID (default)
    "1234"
    # Facebook OAuth Secret (default)
    "abcd"
    # Google OAuth Client ID (default)
    "5678"
    # Google OAuth Secret (default)
    "qwer"
)
printf "%s\n" "${CREDENTIALS[@]}"