linux更新grub内核启动参数的方法

#!/bin/bash
set -x
set -e
export PS4=+{$LINENO:${FUNCNAME[0]}}
trap ‘echo "---NEWKERNARGS=$NEWKERNARGS xx=$xx------"‘ DEBUG

NEWKERNARGS=""
grubby --info=`/sbin/grubby --default-kernel` 2>/dev/null | grep -q crashkernel
if [ $? -ne 0 ];then
    NEWKERNARGS="--kernel-args=\"crashkernel=auto\""
fi

xx=123
grubby --info=`/sbin/grubby --default-kernel` 2>/dev/null | grep -q "nopti noibrs noibpb"
if [ $? -ne 0 ];then
    NEWKERNARGS="--kernel-args=\"crashkernel=auto nopti noibrs noibpb\""
fi


/sbin/new-kernel-pkg --package kernel%{?1:-%{1}}  %{!?1:--make-default} --install %{KVERREL}%{?1:.%{1}}