uuidgen: add page

pages/linux/uuidgen.md

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+# uuidgen
+
+> Generate unique identifiers (UUIDs).
+
+- Create a random UUID:
+
+`uuidgen --random`
+
+- Create a UUID based on the current time:
+
+`uuidgen --time`
+
+- Create a UUID based on the hash of a URL:
+
+`uuidgen --sha1 --namespace {{@url}} --name {{object_name}}`