ap42:secrets user$ cat test
USERNAME=zerocool
PASSWORD=crash_override

ap42:secrets user$ ./secret.sh test
enter aes-256-cbc encryption password:
Verifying - enter aes-256-cbc encryption password:

ap42:secrets user$ ls
secret.sh	test.enc

ap42:secrets user$ cat test.enc
U2FsdGVkX181vM9+ukx21/sq9LnRy78bQ7dYu7q71mGukcDAqpJ3v+cUjeWUjqsC
gRpELQfQWTTj6GI5l9PIHA==

ap42:secrets user$ echo $USERNAME $PASSWORD

ap42:secrets user$ source ./secret.sh test.enc
enter aes-256-cbc decryption password:
USERNAME
PASSWORD

ap42:secrets user$ echo $USERNAME $PASSWORD
zerocool crash_override
ap42:secrets user$