findfs: add page (#3850)

pages/linux/findfs.md

@@ -0,0 +1,20 @@
+# findfs
+
+> Finds a filesystem by label or UUID.
+> More information: <https://mirrors.edge.kernel.org/pub/linux/utils/util-linux>.
+
+- Search block devices by filesystem label:
+
+`findfs LABEL={{label}}`
+
+- Search by filesystem UUID:
+
+`findfs UUID={{uuid}}`
+
+- Search by partition label (GPT or MAC partition table):
+
+`findfs PARTLABEL={{partition_label}}`
+
+- Search by partition UUID (GPT partition table only):
+
+`findfs PARTUUID={{partition_uuid}}`