script to check for environment variables

check_env

#!/usr/bin/env bash

. /etc/init.d/functions

declare -a env_variables=(FOO BAR)

function checkVariables {
  for var in "${env_variables[@]}"
  do
    if env | grep -q ^"$var="
    then
      echo -n "  $var: " && success
      echo
    else
      echo -n "  $var: " && failure
      echo
      echo -n "  "
      cat env_vars/$var.md
      echo
    fi
  done
}

echo "Checking for environment variables:"
checkVariables

// -----------------------------------
// EXAMPLE:
// output if FOO is set but BAR is not
//
// Checing for environment variables:
//   FOO                        [  OK  ]
//   BAR                        [FAILED]
//   the path to a program that should be run

env_vars-BAR.md

the path to a program that should be run

env_vars-FOO.md

FOO specifies the number of times to run $BAR