Update cheatsheets

tldr/linux/mknod

@@ -22,4 +22,4 @@ source: https://github.com/tldr-pages/tldr.git
 
 - Create a device file with default SELinux security context:
 
-`sudo mknod {{[-Z |--context=]}}{{path/to/device_file}} {{type}} {{major_device_number}} {{minor_device_number}}`
+`sudo mknod {{[-Z|--context]}} {{path/to/device_file}} {{type}} {{major_device_number}} {{minor_device_number}}`

tldr/linux/nl

@@ -36,6 +36,6 @@ source: https://github.com/tldr-pages/tldr.git
 
 `nl {{[-w|--number-width]}} {{col_width}} {{path/to/file}}`
 
-- Use a specific string to separate the line numbers from the lines (TAB by default):
+- Use a specific string to separate the line numbers from the lines (`TAB` by default):
 
 `nl {{[-s|--number-separator]}} {{separator}} {{path/to/file}}`

tldr/linux/pivot_root

@@ -0,0 +1,18 @@
+---
+syntax: markdown
+tags: [tldr, linux]
+source: https://github.com/tldr-pages/tldr.git
+---
+# pivot_root
+
+> Change the root filesystem to a new directory and move the current root to a subdirectory of the new root.
+> Commonly used during system initialization (e.g., in `initramfs`) to switch from a temporary root to the real root filesystem.
+> More information: <https://manned.org/pivot_root.8>.
+
+- Make `/new_root` the new root (`/`) and move current root to a subdirectory of it:
+
+`sudo pivot_root {{path/to/new_root}} {{path/to/new_root/old_root}}`
+
+- Display help:
+
+`pivot_root {{[-h|--help]}}`