Sets command args using environment variables with prefix

startup.sh

#! /bin/sh
set -e

# Script extract env vairables by prefix
# and passes as command arguments

cmd=${1}
shift
if [ "$cmd" = "" ] 
then
   echo "Error, set application run command as argument."
   exit 1
fi

args_prefix="APP_"
args=""

for item in $(env)
do
   key=$(echo $item | cut -d '=' -f1)
   value=$(echo $item | cut -d '=' -f2)

   if  [[ $key == $args_prefix* ]];
   then
      key=${key#"$args_prefix"}
      # convert underscores to hyphens 
      # (not consist across all services)
      # need to this out    
      key=${key//_/-}
      args="$args--$key $value "
   fi
done

args="$args$@"

exec $cmd $args 

#Test flight