$ array=(a b c) $ (IFS=,; echo "${array[*]}") a,b,c
DOCKER_APP_VARS=(DATABASE_USER=dbuserro, DATABASE_PASSWORD=maipass)
[jeff@omniscience container] (master)$ echo docker run $(printf -- " -e %s" ${DOCKER_APP_VARS[*]}) -name 12factorapp mattdm/fedora-small
docker run -e DATABASE_USER=dbuserro, -e DATABASE_PASSWORD=maipass -name 12factorapp mattdm/fedora-small
Note that the printf method by itsself doesn't include a newline (\n), so you'll need to embed it into an echo statement or something that does.
Show Sample Output
printf reapeats the format as longer as it has arguments. Then the idea is to make cut retain as much fields as we have elements in the array. As usual with such join/split string manipulation, you have to make sure you don't have conflicts between your separator and your array content.
Any thoughts on this command? Does it work on your machine? Can you do the same thing with only 14 characters?
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