Read parameters from AWS SSM specified in a properties file and replace the keys in a configuration file with the parameter values

config.json

{
  "foo": BAR
}

script.sh

#! /bin/bash

aws ssm get-parameters --names $(awk -F "=" '{ print $2 }' secret.properties | paste -s -d " " -) --with-decryption \
  | jq '.Parameters[] | "s~\(.Name)~\"\(.Value)\"~"' | jq -rs '. | join(";")' \
  | { read re; sed -e "$re" secret.properties; } \
  | awk -F "=" '{ print "s~" $1 "~" $2 "~g" }' | paste -s -d "; " - \
  | { read re; sed -e "$re" config.json; }

secret.properties

BAR=/my/secret/param