Regex Majic

grub-test.sh

#!/usr/bin/env bash

cat << EOF > grub.orig.conf
# If you change this file, run 'update-grub' afterwards to update

GRUB_DEFAULT=0
GRUB_TIMEOUT_STYLE=hidden
GRUB_TIMEOUT=0
GRUB_DISTRIBUTOR=`lsb_release -i -s 2> /dev/null || echo Debian`
GRUB_CMDLINE_LINUX_DEFAULT="quiet"
GRUB_CMDLINE_LINUX="net.ifnames=0 biosdevname=0 "

# Uncomment to enable BadRAM filtering, modify to suit your needs
EOF

cat << EOF
Objective-> Using the created file grub.orig.conf, create a regex inline replace to meet the following:

    Make the line:

        GRUB_CMDLINE_LINUX_DEFAULT="quiet"

    be:
        GRUB_CMDLINE_LINUX_DEFAULT="quiet ipv6.disable=1"

    And:

    Make the line:

        GRUB_CMDLINE_LINUX="net.ifnames=0 biosdevname=0 "

    be:
        GRUB_CMDLINE_LINUX="net.ifnames=0 biosdevname=0 ipv6.disable=1"

EOF