Update cheatsheets

linux/grub-editenv

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+---
+syntax: markdown
+tags: [tldr, linux]
+source: https://github.com/tldr-pages/tldr.git
+---
+# grub-editenv
+
+> Edit GRUB environment variables.
+> More information: <https://www.gnu.org/software/grub/manual/grub/grub.html>.
+
+- Set a default boot entry (Assuming the boot entry already exists):
+
+`grub-editenv /boot/grub/grubenv set default={{Ubuntu}}`
+
+- Display the current value of the `timeout` variable:
+
+`grub-editenv /boot/grub/grubenv list timeout`
+
+- Reset the `saved_entry` variable to the default:
+
+`grub-editenv /boot/grub/grubenv unset saved_entry`
+
+- Append "quiet splash" to the kernel command line:
+
+`grub-editenv /boot/grub/grubenv list kernel_cmdline`