You can disable the sound bell in xterm by writing in /etc/inputrc the folloing sentence: set bell-style none In my mac book pro, there was no /etc/inputrc. So I made the text file of this one line. It worked.

Grub2 uses a combination of menuentries and submenus. We can select a kenel as default in a manner like this: 1) Edit /etc/default/grub GRUB_DEFAULT="1>10" 2) grub-mkconfig -o /boot/grub/grub.cfg In this case, the 10 th menuentry kernel in…