pivot_root: add page (#19673)

* Create pivot_root.md

* Update pivot_root.md

* Update pivot_root.md

* Update pages/linux/pivot_root.md

Co-authored-by: Managor <42655600+Managor@users.noreply.github.com>

* Update pivot_root.md

Co-authored-by: Managor <42655600+Managor@users.noreply.github.com>

* Update pivot_root.md

Co-authored-by: Managor <42655600+Managor@users.noreply.github.com>

* Update pivot_root.md

Co-authored-by: Managor <42655600+Managor@users.noreply.github.com>

* Update pivot_root.md

Co-authored-by: Ivan Baluta <50071699+ivanbaluta@users.noreply.github.com>

* Update pages/linux/pivot_root.md

Co-authored-by: Sebastiaan Speck <12570668+sebastiaanspeck@users.noreply.github.com>

---------

Co-authored-by: Managor <42655600+Managor@users.noreply.github.com>
Co-authored-by: Sebastiaan Speck <12570668+sebastiaanspeck@users.noreply.github.com>
Co-authored-by: Ivan Baluta <50071699+ivanbaluta@users.noreply.github.com>

Author: 4 people

pages/linux/pivot_root.md

@@ -0,0 +1,13 @@
+# 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]}}`