I installed Red Hat Linux7.3,and then I update kernel,when I reboot again,I found I can select new kernel or old kernel from screen. The default select option is old kernel. I want to know which file i can modify in order to make default select option is new kernel,how to modify it?If using lilo, you would set the default boot kernal in /etc/lilo.conf and then run /sbin/lilo.
If using grub then /etc/grub.conf and then check the man pages for grub.
Good luck,
Bill
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