Update cheatsheets

osx/spctl

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+---
+syntax: markdown
+tags: [tldr, osx]
+source: https://github.com/tldr-pages/tldr.git
+---
+# spctl
+
+> Manage the security assessment policy subsystem.
+> Utility for managing Gatekeeper in macOS.
+> More information: <https://keith.github.io/xcode-man-pages/spctl.8.html>.
+
+- Turn off Gatekeeper:
+
+`spctl --master-disable`
+
+- Add a rule to allow an application to run (labeling of rule is optional):
+
+`spctl --add --label {{rule_name}} {{path/to/file}}`
+
+- Turn on Gatekeeper:
+
+`spctl --master-enable`
+
+- List all rules on the system:
+
+`spctl --list`