How to use GnuPG (gpg) to non-interactively decrypt or sign without password prompts

Solution Verified - Updated -

Issue

  • How can I pass my pgp key password to gpg in a script so that it doesn't require interactively entering the password?

  • How to get gnupg to accept a passphrase on the command-line without prompting?

Environment

  • Red Hat Enterprise Linux 7
  • Red Hat Enterprise Linux 6
  • Red Hat Enterprise Linux 5

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