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I would like to know how to use grub and what it is used for. I would also like to know if I can boot freebsd and linux with grub. I have googled it but couldn't find much
grub is a bootloader that allows you to boot multiple distros and or kernels. Your motherboard should allow you to boot multiple partitions.
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Hard links cannot span physical devices. Exactly this statement I read while understanding the concept of hard link in Linux. Can anyone help me to understand this ?
A filename, is a pointer to an inode.
So if you're not on the same drive, it's impossible to link a file, because the inodes belongs to a specific disk
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I've learned that linux directory is a file. So can I view it in binary mod like viewing other files with hexdump?
You can dump raw portions of a drive using the dd command and that is about as low level as you can get. You can also use debugfs to do maintenance on the filesystem.
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Closed 8 years ago.
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I want to modify sched.h to add in some scheduling algorithm. I use find / -name sched.h command finding a lot of results.But which one should I really modify ?
And in /usr/src,there are a lot of relating folders whose names are similiar. I'm using ubuntu14.04. Where are my real source code?
use uname -a to see which kernel you are currently running. After that, i would edit the /include/linux/sched.h for that kernel.
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I am using Ubuntu 12.04, and I used to see #include , I want to see the implementation code of sys/stat.h. But I don not know where it is. By the way, I can not find it in /usr/include directory.
on my machine there are
/usr/include/x86_64-linux-gnu/sys/stat.h
/usr/lib/syslinux/com32/include/sys/stat.h
I think the first one is what you are looking for? it comes with gnu gcc I think
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I wanted to know what exactly does happen to a packet by the time it goes to a linux kernel, until it comes out of kernel and goes as application layer.
There is a nice paper PATH OF A PACKET IN THE LINUX
KERNEL STACK(pdf), with examples and links to the kernel source code.