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+Style Guide
+-----------
+
+Usage
+=====
+
+* Always echo to `stderr`.
+* Exit with code 1.
+* Enclose required arguments in angle brackets: `-v <version>`
+* Enclose optional arguments in square brackets: `[-h hook]`
+
+    usage() {
+      echo "usage: $0 -v <version> [-h hook]"
+      exit 1
+    }
+
+