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I am looking for an easy encryption program, usable from the linux command line. Preferably a single static binary. I tried scrypt (tarsnap), but it prompts for a password with no way to input as a flag. This means it cannot be used from a script.
Thank you for the help!

  • I'm not sure why you believe it cannot be used from a script. Check out this question and its detailed answer. It depends on the <<< operator. Also, a standard way to automate tasks which require user input is the Expect program, which likely already comes installed on your system and is easily acquired if not. – John Y Oct 1 '18 at 19:48
  • Oh, I had meant to link to a Stack Overflow question for possible tips and further reading on expect, though the Wikipedia entry actually does have some nice examples already. – John Y Oct 1 '18 at 20:17
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You could use PGP/gpg:

# Encrypt
gpg --output file.gpg --encrypt --recipient your@self.com file

# Decrypt
gpg --output file --decrypt file.gpg

Before you can do that, you need to create a key pair and import it to your keyring. See the manual on how to do it: https://www.gnupg.org/gph/en/manual/book1.html

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