/usr/sbin/grub-set-default is in grub2-common 1.99-21ubuntu3.
This file is owned by root:root, with mode 0o755.
The actual contents of the file can be viewed below.
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#
# Set a default boot entry for GRUB.
# Copyright (C) 2004,2009 Free Software Foundation, Inc.
#
# GRUB is free software: you can redistribute it and/or modify
# it under the terms of the GNU General Public License as published by
# the Free Software Foundation, either version 3 of the License, or
# (at your option) any later version.
#
# GRUB is distributed in the hope that it will be useful,
# but WITHOUT ANY WARRANTY; without even the implied warranty of
# MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
# GNU General Public License for more details.
#
# You should have received a copy of the GNU General Public License
# along with GRUB. If not, see <http://www.gnu.org/licenses/>.
# Initialize some variables.
transform="s,x,x,"
prefix=/usr
exec_prefix=${prefix}
bindir=${exec_prefix}/bin
PACKAGE_NAME=GRUB
PACKAGE_VERSION=1.99-21ubuntu3
self=`basename $0`
grub_editenv=${bindir}/`echo grub-editenv | sed ${transform}`
rootdir=
bootdir=
grubdir=`echo "/boot/grub" | sed 's,//*,/,g'`
# Usage: usage
# Print the usage.
usage () {
cat <<EOF
Usage: $self [OPTION] entry
Set the default boot entry for GRUB.
-h, --help print this message and exit
-v, --version print the version information and exit
--boot-directory=DIR expect GRUB images under the directory DIR/grub
instead of the $grubdir directory
ENTRY is a number or a menu item title.
Report bugs to <bug-grub@gnu.org>.
EOF
}
argument () {
opt=$1
shift
if test $# -eq 0; then
echo "$0: option requires an argument -- '$opt'" 1>&2
exit 1
fi
echo $1
}
# Check the arguments.
while test $# -gt 0
do
option=$1
shift
case "$option" in
-h | --help)
usage
exit 0 ;;
-v | --version)
echo "$self (${PACKAGE_NAME}) ${PACKAGE_VERSION}"
exit 0 ;;
# Accept for compatibility
--root-directory)
rootdir=`argument $option "$@"`; shift ;;
--root-directory=*)
rootdir=`echo "$option" | sed 's/--root-directory=//'` ;;
--boot-directory)
bootdir=`argument $option "$@"`; shift;;
--boot-directory=*)
bootdir=`echo "$option" | sed 's/--boot-directory=//'` ;;
-*)
echo "Unrecognized option \`$option'" 1>&2
usage
exit 1
;;
*)
if test "x$entry" != x; then
echo "More than one entry?" 1>&2
usage
exit 1
fi
entry="${option}" ;;
esac
done
if test "x$entry" = x; then
echo "entry not specified." 1>&2
usage
exit 1
fi
if [ -z "$bootdir" ]; then
# Default bootdir if bootdir not initialized.
bootdir=/boot
if [ -n "$rootdir" ] ; then
# Initialize bootdir if rootdir was initialized.
bootdir=${rootdir}/boot
fi
fi
grubdir=`echo "${bootdir}/grub" | sed 's,//*,/,g'`
$grub_editenv ${grubdir}/grubenv unset prev_saved_entry
$grub_editenv ${grubdir}/grubenv set saved_entry="$entry"
# Bye.
exit 0
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