CentOS7.3机时的菜单选择时间由5秒缩短为2秒

[root@centos7 ~] #2> vim /etc/default/grub

[root@centos7 ~] #3> vim /boot/grub2/grub.cfg

[root@centos7 centos] #16> vim /boot/efi/EFI/centos/grub.cfg

＃将开机时的菜单选择时间由5秒缩短为2秒
＃将set timeout=5修改为set timeout=2即可
if [ x$feature_timeout_style = xy  ] ; then
    set timeout_style=menu
    set timeout=2
    # Fallback normal timeout code in case the timeout_style feature is
    # unavailable.
else
    set timeout=2                                                                 
fi