This file is indexed.

/usr/lib/grub/x86_64-emu/command.lst is in grub-emu 1.99-21ubuntu3.

This file is owned by root:root, with mode 0o644.

The actual contents of the file can be viewed below.

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*background_image: gfxterm
*cat: cat
*crc: hashsum
*echo: echo
*functional_test: functional_test
*gettext: gettext
*hashsum: hashsum
*hello: hello
*help: help
*hexdump: hexdump
*keystatus: keystatus
*list_env: loadenv
*load_env: loadenv
*loopback: loopback
*ls: ls
*md5sum: hashsum
*menuentry: normal
*probe: probe
*read_byte: memrw
*read_dword: memrw
*read_word: memrw
*regexp: regexp
*save_env: loadenv
*search: search
*sha1sum: hashsum
*sha256sum: hashsum
*sha512sum: hashsum
*sleep: sleep
*submenu: normal
*terminfo: terminfo
*test_blockarg: test_blockarg
.: configfile
[: test
authenticate: normal
background_color: gfxterm
blocklist: blocklist
boot: boot
break: normal
cat: minicmd
clear: normal
cmp: cmp
configfile: configfile
continue: normal
date: date
dump: minicmd
exit: minicmd
export: normal
extract_entries_configfile: configfile
extract_entries_source: configfile
extract_legacy_entries_configfile: legacycfg
extract_legacy_entries_source: legacycfg
false: true
gptsync: gptsync
halt: halt
help: minicmd
keymap: keylayouts
legacy_check_password: legacycfg
legacy_configfile: legacycfg
legacy_initrd: legacycfg
legacy_initrd_nounzip: legacycfg
legacy_kernel: legacycfg
legacy_password: legacycfg
legacy_source: legacycfg
loadfont: font
lsfonts: font
lsmmap: lsmmap
lsmod: minicmd
normal: normal
normal_exit: normal
parttool: parttool
password: password
password_pbkdf2: password_pbkdf2
read: read
reboot: reboot
return: normal
rmmod: minicmd
search.file: search_fs_file
search.fs_label: search_label
search.fs_uuid: search_fs_uuid
setparams: normal
shift: normal
source: configfile
terminal_input: terminal
terminal_output: terminal
test: test
testload: testload
true: true
videoinfo: videoinfo
videotest: videotest
write_byte: memrw
write_dword: memrw
write_word: memrw
xnu_uuid: xnu_uuid
zfs-bootfs: zfsinfo
zfsinfo: zfsinfo