tune2fs: update page (#19071)

Author: dmmqz

pages/linux/tune2fs.md

@@ -6,16 +6,20 @@
 
 - Set the max number of counts before a filesystem is checked to 2:
 
-`tune2fs -c 2 {{/dev/sdXN}}`
+`sudo tune2fs -c 2 {{/dev/sdXN}}`
 
 - Set the filesystem label to MY_LABEL:
 
-`tune2fs -L 'MY_LABEL' {{/dev/sdXN}}`
+`sudo tune2fs -L 'MY_LABEL' {{/dev/sdXN}}`
 
 - Enable discard and user-specified extended attributes for a filesystem:
 
-`tune2fs -o {{discard,user_xattr}} {{/dev/sdXN}}`
+`sudo tune2fs -o discard,user_xattr {{/dev/sdXN}}`
 
 - Enable journaling for a filesystem:
 
-`tune2fs -o ^{{nobarrier}} {{/dev/sdXN}}`
+`sudo tune2fs -o has_journal {{/dev/sdXN}}`
+
+- Assign a new randomly-generated UUID to a filesystem:
+
+`sudo tune2fs -U random {{/dev/sdXN}}`