After installing everything and configuring everything in the way we want, we can start on encrypting and decrypting.
When encrypting or decrypting it is possible to have more than one private key
in use. If this occurs you need to select the active key. This can be done by
using the option -u UID or by using the option --local-user UID.
This causes the default key to use to be replaced by wanted key.
If you want to change recipient this can be done by the option -r
or by the option --recipient.
The command to encrypt is
gpg -e Recipient [Data]
gpg --encrypt Recipient [Data]
The command for decrypting is:
gpg [-d] [Data]
gpg [--decrypt] [Data]
stdout is preset, but with the -o option you can
redirect the output to a file.