sed -i "s/^\(GRUB_CMDLINE_LINUX=.*\)\"$/\1 $kernel_cmdline\"/g" /sysroot/etc/default/grub
else
echo "GRUB_CMDLINE_LINUX=\"$kernel_cmdline\"" >> /sysroot/etc/default/grub
sed -i "s/^\(GRUB_CMDLINE_LINUX=.*\)\"$/\1 $kernel_cmdline\"/g" /sysroot/etc/default/grub
else
echo "GRUB_CMDLINE_LINUX=\"$kernel_cmdline\"" >> /sysroot/etc/default/grub