Help with this little script..

[wastedfluid]

Hello all, new to these forums.

I'm trying to make a little Superkaramba theme.. I've came along ways from last night. I started looking up functions like "cut", and "awk" - and reading tons of examples(many from this very forum, which is why I registered)

So, my question is:

"sensors" returns for me:

wasted@tronic:~$ sensors
k8temp-pci-00c3
Adapter: PCI adapter
Core0 Temp: +29.0°C
Core0 Temp: +22.0°C
Core1 Temp: +22.0°C
Core1 Temp: +19.0°C

Trying to extract the first line, "Core0" - the 29C one.

Here's what I have:

wasted@tronic:~$ sensors | grep Core0 | cut -d'+' -f2 | cut -d'.' -f1
29
22

How do I just solely return the 29? I was thinking about awk, and printing $1, but since there's two lines, it prints $1 from both lines.

Thanks for your help

[vsemaska]

If you want the 1st line found you could use the 'head' command.

sensors | grep Core0 | head -n1 | cut -d'+' -f2 | cut -d'.' -f1

EDIT:

Just figured this out in awk:

sensors | awk '/Core0/ {print substr($3,2,2); exit}'

[wastedfluid]

If you want the 1st line found you could use the 'head' command.

sensors | grep Core0 | head -n1 | cut -d'+' -f2 | cut -d'.' -f1

EDIT:

Just figured this out in awk:

sensors | awk '/Core0/ {print substr($3,2,2); exit}'

Thanks! That';s exactly what I was looking for.


head -n1 is kind of useful. head -n2 shows both lines, though. I tried playing with your print substr, but failed(trying to retrieve the second value.)

i tried:

sensors | awk '/Core0/ {print substr($6,2,2); exit}'

But it just returns spaces. I was thinking $6 would pick up the second temperature, since it's the 6th value.

How could you retrieve the second value, though?

[wje_lf]

head -n1 is kind of useful. head -n2 shows both lines, though. I tried playing with your print substr, but failed(trying to retrieve the second value.)

I really don't understand what's going on in this thread, but I'll stick my neck out. To get just the second line, do this:

blah blah | head -n2 | tail -n1

[wastedfluid]

Thanks. Much appreciation to both of you.

[vsemaska]

Thanks! That';s exactly what I was looking for.


head -n1 is kind of useful. head -n2 shows both lines, though. I tried playing with your print substr, but failed(trying to retrieve the second value.)

i tried:

sensors | awk '/Core0/ {print substr($6,2,2); exit}'

But it just returns spaces. I was thinking $6 would pick up the second temperature, since it's the 6th value.

How could you retrieve the second value, though?

The $6 means to use the 6th field of each line found. Since there are 3 (space separated) fields on each line that's why you got nothing. You'd have to add a counter to select the line you want.

sensors | awk 'BEGIN {ct=0} /Core0/ {ct=ct+1; if (ct==2) {print substr($3,2,2); exit}}'

[wastedfluid]

Thank you. I'm saving this.. very useful stuff. I appreciate all the help so far. Truly badass.

[secondmouse]

sensors | awk 'BEGIN {ct=0} /Core0/ {ct=ct+1; if (ct==2) {print substr($3,2,2); exit}}'

To get the third line you don't really need a function to do it. awk has built-in support to extract line(s) by line number (1-based). That's why NR exists for a reason. The above code could be written as:

sensors | awk '(NR==3),/Core0/{print $3}' | cut -f2 -d+ | cut -f1 -d.

I don't use substr here because if the temperature is 3-digits (I know it's not likely but still possible) then you only get the first two-digits of the temperature.

[ghostdog74]

awk 'BEGIN{FS="[a-z:+°C]+"}/Core0/{ print $4;exit}' file