shell - How to Export a Multi-line Environment Variable in Bash/Terminal e.g: RSA Private Key

Question

One of our Apps github-backup requires the use of an RSA Private Key as an Environment Variable.

Simply attempting to export the key it in the terminal e.g: text export PRIVATE_KEY=-----BEGIN RSA PRIVATE KEY----- MIIEpAIBAAKCAQEA04up8hoqzS1+ ... l48DlnUtMdMrWvBlRFPzU+hU9wDhb3F0CATQdvYo2mhzyUs8B1ZSQz2Vy== -----END RSA PRIVATE KEY-----

Does not work ... because of the line breaks.

I did a bit of googling but did not find a workable solution ...
e.g: How to set multiline RSA private key environment variable for AWS Elastic Beans

Error: -----END RSA PRIVATE KEY-----': not a valid identifier

followed the instructions in: http://blog.vawter.com/2016/02/10/Create-an-Environment-Variable-from-a-Private-Key

Created a file called keytoenvar.sh with the following lines:

#!/usr/bin/env bash
file=$2
name=$1
export $name="$(awk 'BEGIN{}{out=out$0"
"}END{print out}' $file| sed 's/
$//')"

then ran the following command:

source keytoenvar.sh PRIVATE_KEY ./gitbu.2018-03-23.private-key.pem

That works but it seems like a "long-winded" approach ... ??

Does anyone know of a simpler way of doing this?
(I'm hoping for a "beginner friendly" solution without too many "steps"...)

Answer 1

export the key

export PRIVATE_KEY=`cat ./gitbu.2018-03-23.private-key.pem`

test.sh

#!/bin/bash

echo "$PRIVATE_KEY"; 

If you want to save the key to a .env file with the rest of your environment variables, all you needed to do is "wrap" the private key string in single quotes in the .env file ... e.g: sh exports HELLO_WORLD='-----BEGIN RSA PRIVATE KEY----- MIIEpAIBAAKCAQEA04up8hoqzS1+APIB0RhjXyObwHQnOzhAk5Bd7mhkSbPkyhP1 ... iWlX9HNavcydATJc1f0DpzF0u4zY8PY24RVoW8vk+bJANPp1o2IAkeajCaF3w9nf q/SyqAWVmvwYuIhDiHDaV2A== -----END RSA PRIVATE KEY-----' So the following command will work:

echo "export PRIVATE_KEY='`cat ./gitbu.2018-03-23.private-key.pem`'" >> .env

Followed by:

source .env

Now the key will be in your .env file and whenever you source .env it will be exported.