Update cheatsheets

keychain

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+---
+syntax: markdown
+tags: [tldr, common]
+source: https://github.com/tldr-pages/tldr.git
+---
+# keychain
+
+> Re-use ssh-agent and/or gpg-agent between logins.
+> More information: <http://funtoo.org/Keychain>.
+
+- Check for a running ssh-agent, and start one if needed:
+
+`keychain`
+
+- Also check for gpg-agent:
+
+`keychain --agents "{{gpg,ssh}}"`
+
+- List signatures of all active keys:
+
+`keychain --list`
+
+- List fingerprints of all active keys:
+
+`keychain --list-fp`
+
+- Add a timeout for identities added to the agent, in minutes:
+
+`keychain --timeout {{minutes}}`