grub-script-check: add page (#9336)

pages/linux/grub-script-check.md

@@ -0,0 +1,21 @@
+# grub-script-check
+
+> The program `grub-script-check` takes a GRUB script file and checks it for syntax errors.
+> It may take a path as a non-option argument. If none is supplied, it will read from standard input.
+> More information: <https://www.gnu.org/software/grub/manual/grub/html_node/Invoking-grub_002dscript_002dcheck.html>.
+
+- Check a specific script file for syntax errors:
+
+`grub-script-check {{path/to/grub_config_file}}`
+
+- Display each line of input after reading it:
+
+`grub-script-check --verbose`
+
+- Display version:
+
+`grub-script-check --version`
+
+- Display help:
+
+`grub-script-check --help`