在Lubuntu的哪里可以找到内核.config文件？

Question

I'm running through the "first kernel patch" tutorial on kernel newbies http://kernelnewbies.org/FirstKernelPatch

While running through the tutorial, i've had absolutely no issues what so ever until now, I am at a point where I am setting up my kernel configuration. I've followed the tutorial exactly as shown but the following command:

cp /boot/config-'uname -r'* .config

leaves me with the following error message in the terminal:

cp: cannot stat '/boot/config-uname -r*': No such file or directory

Is there a way I can generate this file without going through the effort of looking for it in the finder? I'd rather not go through the thousands of files there are in a kernel, it could take me forever.

Answer 1

It seems like your tutorial has a quotation error. instead of ' you should be using ` (backtick)

cp /boot/config-`uname -r`* .config

What it does is execute the command uname -r and place the stdout of the command in place of the command. I'd suggest using $(command) instead of `command` since it's more obvious what is going on.

cp /boot/config-$(uname -r)* .config

Answer 2

First things first .. You're using simple quotes which is wrong, the command is meant to use backticks (`) -- they will include the output of the command inside them:

> uname -r
3.16.1-ck1
> echo /boot/config-`uname -r`
/boot/config-3.16.1-ck1

So this could already solve your problem.

If this file isn't present on your system, you have some alternatives:

1. If you have the source the running kernel is built from, the kernel config is the file .config there.

2. Although most packaging/installation systems copy the kernel config to /boot/config-`uname -r` , some just copy it to /boot/config (without version suffix)

3. The kernel can be built to serve it's config in /proc/config.gz (gzip compressed)

If really neither of these succeed, you're out of luck and your only option is get hold of the source package your kernel is built from.