A Newbie,s Scripting Question

newpenguin · 09-30-2002, 05:09 PM

hello i have a problem in scripting , actually just started the scripting.

hope you will be able to understand it

i want to enter in running kernel,s modules directory in a script
like "/lib/modules/running kernel/driver...."
i know that "uname -r" command will print the running kernels name , and it can help me in this case
but how to use it in the script ????
thanks for your help .

acid_kewpie · 09-30-2002, 05:14 PM

Code:

[chris@trevor chris]$ echo /usr/lib/`uname -r`/kernel
/usr/lib/2.4.18/kernel

newpenguin · 09-30-2002, 07:42 PM

sorry to say but it didnt worked.
i think my stupid mind is not able to understand it .
please if you can explain ?
i want to do "cd /lib/modules/running kernel/........"

unSpawn · 09-30-2002, 08:29 PM

Like he said (w/o outer quotes): "cd /lib/modules/`uname -r`/kernel" :-]
Note the backticks can also be replaced with $(), as in "cd /lib/modules/$(uname -r)/kernel" but that's coding stylee.

If you ever come across a piece of code you can't understand there's two things make it more understandable. If you run it from a script you can execute the script as "sh -x <scriptname>" which will show you all the actual values your script works with. The second thing is echoing. For the above example try on the commandline: "echo "cd /lib/modules/`uname -r`/kernel"". Notice we just put echo in front and wrap the whole command in double quotes. It should return the line which would be executed as command.

Faecal · 10-01-2002, 07:03 AM

Quotes have never worked for me with commandline substitutions - I've always had to use $(). Just an observation (bash,RH).

acid_kewpie · 10-01-2002, 09:51 AM

quotes are not the same as bacticks, do not confuse the two.

newpenguin · 10-02-2002, 01:23 PM

now when i read it cleared my concept that
`uname -r` = $(uname -r)
but actually the `uname -r` was case sensative and i was using like this `uname -r' which was wrong.
thanks a lot for the help of you .
this is really a helpfull site.

newpenguin · 10-07-2002, 12:52 PM

hello all
so this is my first script for which thisthread was created.
my problem was to load the sound module for 3 kernels in slackware.but its compatible only with new kernels

so i put these lines in /etc/rc.d/rc.local

cd /lib/modules/`uname -r`/kernel/drivers/sound/

if [ -f via82cxxx_audio.o ]; then

modprobe \*via82cxxx_audio.o

# as one kernel uses .o.gz modules
else

modprobe \*via82cxxx_audio.o.gz

fi

cd ~

a

's first script and only because of slackware.
i know this is nothing for you but for me it is

thanks again for your help.