Using Gnupg and openssl for encryption
I have used Gnupg to encrypt my private files, specially those that I upload to the clouds, for a long time. I used to encrypt to self, using my own key, then later moved to symmetric encryption only. The command is easy:

To encrypt:

gpg --cipher-algo aes256 --symmetric file.txt

Adding the option --armor to the above will produce an ASCII armoured encrypted file.

To decrypt:

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