Move pages under tldr, lint run.sh, update docs

tldr/oathtool

@@ -0,0 +1,21 @@
+---
+syntax: markdown
+tags: [tldr, common]
+source: https://github.com/tldr-pages/tldr.git
+---
+# oathtool
+
+> OATH one-time password tool.
+> More information: <https://www.nongnu.org/oath-toolkit/oathtool.1.html>.
+
+- Generate TOTP token (behaves like Google Authenticator):
+
+`oathtool --totp --base32 "{{secret}}"`
+
+- Generate a TOTP token for a specific time:
+
+`oathtool --totp --now "{{2004-02-29 16:21:42}}" --base32 "{{secret}}"`
+
+- Validate a TOTP token:
+
+`oathtool --totp --base32 "{{secret}}" "{{token}}"`