> On August 14, 2016 at 7:12 AM fsmithred <fsmith...@gmail.com> wrote: > > On 08/14/2016 05:50 AM, Peter Olson wrote: > >> On August 14, 2016 at 5:31 AM Arnt Karlsen <a...@iaksess.no> wrote: > > > > [...] > > > >> ..one neat thing about grub, is its shell, once you get the menu, > >> hit "e" and then the tab key twice, and play around to familiarize > >> yourselves with how it works, e.g how it finds disks, files, and > >> how you can boot into root's shell with e.g. "init=/bin/bash". > > > > My own experience with Grub has been less than "neat". > > > > But maybe that is because the times I have experienced Grub, my machine has > > been broken and I have been desperate to fix it. As far as I can tell, > > Grub has no help built in. You have to be an expert to use it. > > > > What does "e" plus tab key twice do? > > > > Is there some way I could try this on a system which boots successfully to > > find out about this? > > > > Peter Olson > > _______________________________________________ > > I had the good fortune to attend a presentation at a LUG meeting on using > the grub shell soon after I started using linux, and before I actually > needed it. I love the grub shell (except when I hate it.) Booting a > working system manually is good practice. > > e lets you edit the highlighted menu entry. > c just drops you to a grub prompt. > TAB complete works > TAB TAB for help. > > This, or some slight variation of it, usually works to boot an > installation on the first partition of the first hard disk: > > c > set root=(hd0,1) > linux /vmlinuz ro root=/dev/sda1 > initrd /initrd.img > boot > > Here's a pretty good guide for booting from the grub shell. > https://www.linux.com/learn/how-rescue-non-booting-grub-2-linux
This was stupendous. I now know how to type something sane at the GRUB-RESCUE> prompt. I have made a cheat sheet, which I will upload to my Wiki in the cloud. Also, this was great: http://www.supergrubdisk.org/ The machine which won't boot has had its partitions thoroughly recreated and permuted, so GRUB has no idea what is going on, but the CD image figures out enough that I can boot either of two systems on the disk (I have a production system and a maintenance/ohshitrecovery system :-). Now I can figure out the fix for the on-board Grub at my leisure. > -fsr Peter Olson _______________________________________________ Dng mailing list Dng@lists.dyne.org https://mailinglists.dyne.org/cgi-bin/mailman/listinfo/dng
