Update cheatsheets

tldr/linux/grub-mount

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+---
+syntax: markdown
+tags: [tldr, linux]
+source: https://github.com/tldr-pages/tldr.git
+---
+# grub-mount
+
+> Mount a file system or file system image read-only using GRUB's file system drivers.
+> More information: <https://www.gnu.org/software/grub/manual/grub/grub.html#Invoking-grub_002dmount>.
+
+- Mount a block device or file system image to a mount point:
+
+`grub-mount {{/dev/sdXY}} {{/mnt}}`
+
+- Mount an entire disk image's second partition, `-r` specifies the partition number in the image:
+
+`grub-mount {{[-r|--root]}} {{2}} {{disk.img}} {{/mnt}}`
+
+- Mount an encrypted device and prompt for a passphrase:
+
+`grub-mount {{[-C|--crypto]}} {{/dev/sdXY}} {{/mnt}}`
+
+- Load a ZFS encryption key from a file:
+
+`grub-mount {{[-K|--zfs-key]}} {{/path/to/zfs.key}} {{/dev/sdX}} {{/mnt}}`
+
+- Show debugging output for a matching category:
+
+`grub-mount {{[-d|--debug]}} {{string}} {{image}} {{/mnt}}`
+
+- Enable verbose output:
+
+`grub-mount {{[-v|--verbose]}} {{image}} {{/mnt}}`
+
+- Display help:
+
+`grub-mount {{[-?|--help]}}`
+
+- Display version:
+
+`grub-mount --version`