Update cheatsheets

gpg2

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+---
+syntax: markdown
+tags: [tldr, common]
+source: https://github.com/tldr-pages/tldr.git
+---
+# gpg2
+
+> GNU Privacy Guard 2.
+> See `gpg` for GNU Privacy Guard 1.
+> More information: <https://docs.releng.linuxfoundation.org/en/latest/gpg.html>.
+
+- List imported keys:
+
+`gpg2 --list-keys`
+
+- Encrypt a specified file for a specified recipient, writing the output to a new file with `.gpg` appended:
+
+`gpg2 --encrypt --recipient {{alice@example.com}} {{path/to/doc.txt}}`
+
+- Encrypt a specified file with only a passphrase, writing the output to a new file with `.gpg` appended:
+
+`gpg2 --symmetric {{path/to/doc.txt}}`
+
+- Decrypt a specified file, writing the result to `stdout`:
+
+`gpg2 --decrypt {{path/to/doc.txt.gpg}}`
+
+- Import a public key:
+
+`gpg2 --import {{path/to/public_key.gpg}}`
+
+- Export the public key of a specified email address to `stdout`:
+
+`gpg2 --export --armor {{alice@example.com}}`
+
+- Export the private key with a specified email address to `stdout`:
+
+`gpg2 --export-secret-keys --armor {{alice@example.com}}`