Update cheatsheets

linux/lvextend

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+---
+syntax: markdown
+tags: [tldr, linux]
+source: https://github.com/tldr-pages/tldr.git
+---
+# lvextend
+
+> Increase the size of a logical volume.
+> See also: `lvm`.
+> More information: <https://manned.org/lvextend.8>.
+
+- Increase a volume's size to 120 GB:
+
+`lvextend --size {{120G}} {{logical_volume}}`
+
+- Increase a volume's size by 40 GB as well as the underlying filesystem:
+
+`lvextend --size +{{40G}} -r {{logical_volume}}`
+
+- Increase a volume's size to 100% of the free physical volume space:
+
+`lvextend --size +{{100}}%FREE {{logical_volume}}`