Update cheatsheets

tldr/linux/blkid

@@ -15,3 +15,7 @@ source: https://github.com/tldr-pages/tldr.git
 - List all partitions in a table, including current mountpoints:
 
 `sudo blkid {{[-o|--output]}} list`
+
+- Get the UUID of the filesystem on a partition:
+
+`blkid {{[-s|--match-tag]}} UUID {{[-o|--output]}} value {{/dev/sdXY}}`

tldr/linux/chmem

@@ -0,0 +1,34 @@
+---
+syntax: markdown
+tags: [tldr, linux]
+source: https://github.com/tldr-pages/tldr.git
+---
+# chmem
+
+> Modify the state of memory blocks (online or offline) in a Linux system.
+> Typically used in virtualized environments to manage memory hotplug.
+> More information: <https://manned.org/chmem>.
+
+- Set a memory block offline:
+
+`sudo chmem {{[-b|--block]}} {{[-d|--disable]}} {{block_number}}`
+
+- Set a memory block online:
+
+`sudo chmem {{[-b|--block]}} {{[-e|--enable]}} {{block_number}}`
+
+- Set a memory range offline using hexadecimal addresses:
+
+`sudo chmem {{[-d|--disable]}} 0x{{start_address}}-0x{{end_address}}`
+
+- Set a memory range online using hexadecimal addresses:
+
+`sudo chmem {{[-e|--enable]}} 0x{{start_address}}-0x{{end_address}}`
+
+- Set memory online and assign it to a specific zone (e.g., Movable):
+
+`sudo chmem {{[-e|--enable]}} 0x{{start_address}} {{[-z|--zone]}} {{Movable}}`
+
+- Display help:
+
+`chmem {{[-h|--help]}}`