some concepts

k84834 · 10-01-2012, 03:13 AM

Hi
I want to know the meaning of below red part

Code:

mknod -m 600 $LFS/dev/console c 5 1
mknod -m 666 $LFS/dev/null c 1 3

I read some text about /dev/null and /dev/console
but if you know about them and can tell me clearly, make me happy

k84834 · 10-01-2012, 04:42 AM

in section 6.5 of lfs-7.2 use install command for create root and tmp and var/tmp directories.
I want to know exactly why we use install command vs mkdir
I saw install man and my question is :

Code:

SYNOPSIS
install [OPTION]... SOURCE DEST (1st format)
install [OPTION]... SOURCE... DIRECTORY (2nd format)
install -d [OPTION]... DIRECTORY... (3rd format)  
DESCRIPTION

In the first two formats, copy SOURCE to DEST or multiple SOURCE(s) to the existing DIRECTORY, while setting permission modes and owner/group. In the third format, create all components of the given DIRECTORY(ies).

what is the meaning of red part ?

pan64 · 10-01-2012, 04:44 AM

see here: http://linux.die.net/man/1/mknod
c means create a character special file, 5 1 and 1 3 are the major/minor addresses.
About major and minor "numbers" see here: http://www.win.tue.nl/~aeb/linux/lk/lk-11.html
(Devices have a number, the device number, a combination of major and minor device number. Traditionally, the major device number gives the kind of device, and the minor device number is some kind of unit number. However, there are no rules - it is best to consider a device number a cookie, without known structure.)

Keith Hedger · 10-01-2012, 06:14 AM

Quote:

Originally Posted by k84834

in section 6.5 of lfs-7.2 use install command for create root and tmp and var/tmp directories.
I want to know exactly why we use install command vs mkdir
I saw install man and my question is :

Code:

SYNOPSIS
install [OPTION]... SOURCE DEST (1st format)
install [OPTION]... SOURCE... DIRECTORY (2nd format)
install -d [OPTION]... DIRECTORY... (3rd format)  
DESCRIPTION

In the first two formats, copy SOURCE to DEST or multiple SOURCE(s) to the existing DIRECTORY, while setting permission modes and owner/group. In the third format, create all components of the given DIRECTORY(ies).

what is the meaning of red part ?

Install is used because it can set permissions and create parent directory's depending on the options used, try

Code:

install -d /tmp/x/y/z

as you can see the folders /tmp/x /tmp/x/y and /tmp/x/y/z are created this is the same as

Code:

mkdir -p /tmp/x/y/z

but mkdir doesn't set permissions

k84834 · 10-06-2012, 05:31 AM

thank you keith hedger and pan64

your guidance be more helpful
I have another question .
can anyone tell me what is ld-new and why we didn't use it from the beginning?
can anyone explain to me what is the meaning of doing these?

Code:

make -C ld clean
make -C ld LIB_PATH=/usr/lib:/lib
cp -v ld/ld-new /tools/bin

Code:

mv -v /tools/bin/{ld,ld-old}
mv -v /tools/$(gcc -dumpmachine)/bin/{ld,ld-old}
mv -v /tools/bin/{ld-new,ld}
ln -sv /tools/bin/ld /tools/$(gcc -dumpmachine)/bin/ld

Keith Hedger · 10-06-2012, 08:44 AM

Quote:

Originally Posted by k84834

thank you keith hedger and pan64

your guidance be more helpful
I have another question .
can anyone tell me what is ld-new and why we didn't use it from the beginning?
can anyone explain to me what is the meaning of doing these?

Code:

make -C ld clean
make -C ld LIB_PATH=/usr/lib:/lib
cp -v ld/ld-new /tools/bin

Code:

mv -v /tools/bin/{ld,ld-old}
mv -v /tools/$(gcc -dumpmachine)/bin/{ld,ld-old}
mv -v /tools/bin/{ld-new,ld}
ln -sv /tools/bin/ld /tools/$(gcc -dumpmachine)/bin/ld

What chapter of what book is this? I don't remember doing this.