Update cheatsheets

linux/uuidgen

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+---
+syntax: markdown
+tags: [tldr, linux]
+source: https://github.com/tldr-pages/tldr.git
+---
+# uuidgen
+
+> Generate unique identifiers (UUIDs).
+> See also `uuid`.
+> More information: <https://manned.org/uuidgen>.
+
+- Create a random UUIDv4:
+
+`uuidgen --random`
+
+- Create a UUIDv1 based on the current time:
+
+`uuidgen --time`
+
+- Create a UUIDv5 of the name with a specified namespace prefix:
+
+`uuidgen --sha1 --namespace {{@dns|@url|@oid|@x500}} --name {{object_name}}`