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linus ALL=(OP) ALL # The user linus can run any command from any terminal as any user in the OP group (root or operator).

user2 OFNET=(ALL) ALL # user user2 may run any command from any machine in the OFNET network, as any user.

, contains the rules that users must follow when using the sudo command.

updating files in pclinux-37

It is safe to experiment at the GRUB command line because nothing you do there is permanent. That means this system has the old-style MS-DOS partition table, rather than the shiny new Globally Unique Identifiers partition table (GPT). Found background: /usr/share/images/grub/Apollo_17_The_Last_Moon_Shot_Edit1Found background image: /usr/share/images/grub/Apollo_17_The_Last_Moon_Shot_Edit1Found linux image: /boot/vmlinuz-3.13.0-29-generic Found initrd image: /boot/initrd.img-3.13.0-29-generic Found linux image: /boot/vmlinuz-3.13.0-27-generic Found initrd image: /boot/initrd.img-3.13.0-27-generic Found linux image: /boot/vmlinuz-3.13.0-24-generic Found initrd image: /boot/initrd.img-3.13.0-24-generic Found memtest86 image: /boot/memtest86 Found memtest86 image: /boot/memtest86 done # grub-install /dev/sda Installing for i386-pc platform.

(See Using the New GUID Partition Table in Linux (Goodbye Ancient MBR).

When you boot up your system and it stops at the , so it probably couldn't find any of your boot files. The kernel might have changed drive assignments or you moved your hard drives, you changed some partitions, or installed a new operating system and moved things around.

In these scenarios your boot files are still there, but GRUB can't find them.

Just make sure the mount point is a directory that already exists on your system. Some partitions and devices are also automatically mounted when your Linux system boots up. This is done automatically when your Linux system boots up...

if it wouldn't, you'd have a hard time using your cool Linux system because all the programs you use are in / and you wouldn't be able to run them if / wasn't mounted!

As you see, every line (or row) contains the information of one device or partition.

The first column contains the device name, the second one its mount point, third its file system type, fourth the mount options, fifth (a number) dump options, and sixth (another number) file system check options. The first and second columns should be pretty straightforward. That is the directory where the device will be mounted if you don't specify any other mount point when mounting the device.

You can use it to discover boot images, kernels, and root filesystems.

In fact, it gives you complete access to all filesystems on the local machine regardless of permissions or other protections.

So you can look for your boot files at the GRUB prompt, set their locations, and then boot your system and fix your GRUB configuration.

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