grub-file: add page (#9917)

pages/linux/grub-file.md

@@ -0,0 +1,28 @@
+# grub-file
+
+> Check if a file is of a specific bootable image type.
+> More information: <https://manned.org/grub-file>.
+
+- Check if a file is an ARM EFI image:
+
+`grub-file --is-arm-efi {{path/to/file}}`
+
+- Check if a file is an i386 EFI image:
+
+`grub-file --is-i386-efi {{path/to/file}}`
+
+- Check if a file is an x86_64 EFI image:
+
+`grub-file --is-x86_64-efi {{path/to/file}}`
+
+- Check if a file is an ARM image (Linux kernel):
+
+`grub-file --is-arm-linux {{path/to/file}}`
+
+- Check if a file is an x86 image (Linux kernel):
+
+`grub-file --is-x86-linux {{path/to/file}}`
+
+- Check if a file is an x86_64 XNU image (Mac OS X kernel):
+
+`grub-file --is-x86_64-xnu {{path/to/file}}`