default user and recipient

[Herb Burnswell]

All,

I am new to pgp and would like to understand the minimum flags that I
should be using for my encryption/decryption needs.  I just want to encrypt
files for decryption by one other person.  We have exchanged public keys.

I have read in several places that I can run:

gpg -e filename

However I receive:

You did not specify a user ID. (you may use "-r")

Current recipients:

Enter the user ID.  End with an empty line:

Questions:

1. Can I set default behavior to not have to specify a user ID?
2. What other flags should be used per best practices?

Any guidance is greatly appreciated,

Herb
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