[bash] sting as variable

dzaku · 06-27-2011, 04:19 AM

Hi
I try set a string element, as variables

Code:

my example :

    for COUNT_IFE in $LIST_IFE
    do
 
       ${COUNT_IFE}="$(echo "$MENU" | grep $(echo $COUNT_IFE) | awk -F' ' '{print  $10 }')"
     
    done

but concole replece me to tty

./pies2.sh: line 19: eth0=5851184659: nie znaleziono polecenia

(translation: command ot found )

colucix · 06-27-2011, 05:03 AM

It is not clear what you're trying to do. However, the left-hand side of an assignment should not have the reference to a variable, but the name of the variable itself, that is

Code:

COUNT_IFE=blahblahblah

instead of

Code:

${COUNT_IFE}=blahblahblah

Moreover, changing the loop variable inside the loop itself has not much sense. Please, show us what is the value of the variables LIST_IFE and MENU, and try to describe what this code is supposed to do.

dzaku · 06-27-2011, 05:32 AM

I writing simple loger form interfaces

Code:

function VARY_IFE {
    ix=0
    for COUNT_IFE in $LIST_IFE
    do

       ${COUNT_IFE}[0]=$(echo "$MENU" | grep $(echo $COUNT_IFE) | awk -F' ' '{print  $10 }')
       ${COUNT_IFE}[1]=$(echo "$MENU" | grep $(echo $COUNT_IFE) | awk -F' ' '{print  $2 }')

       #echo $COUNT_IFE
        ix=$[$ix+1]
    done
}
#Predefined variables
SAVE_F="/tmp/bps_rx.dat"
INAME=$(uname -a | cut -d" " -f2)
ROAD_TO_FILE="/proc/net/dev"
##################Main code
           MENU=$(cat /proc/net/dev)
           _IFE=$(echo "$MENU" | awk '{print $1}')
           NUM_IFE=$(( $(echo "$_IFE" | wc -l ) - 3 ))
           LIST_IFE=$(echo "$_IFE" | tail -$NUM_IFE | sed 's/[:]/ /g' )
            VARY_IFE
           sleep 5

colucix · 06-27-2011, 06:20 AM

Ok. The first problem is what stated in my post above: remove the $ sign form the LHS of the assignments and see if it works as you expect.

grail · 06-27-2011, 07:27 AM

So obviously I am a little bit uncertain as to what your code will eventually achieve, but from what i have followed, the following does all that you have done so far:

Code:

COUNT_IFE=($( awk 'NR > 3{print $2,$10}' /proc/net/dev))

dzaku · 06-27-2011, 09:09 AM

Quote:

Originally Posted by grail

So obviously I am a little ....

I want write simple script for generate charts (gnuplot) from all interfaces in workstation or server. @Grail you idea is great, I just read how to redirect a variable to awk
Thansk for help colucix and grail

catkin · 06-27-2011, 09:31 AM

Quote:

Originally Posted by grail

Code:

COUNT_IFE=($( awk 'NR > 3{print $2,$10}' /proc/net/dev))

That's an ingenious technique, grail, using an array assignment to parse out the first word and then using the array variable name without a subscript to dereference the first member of the array