[SOLVED] Shell script errors

Acnologia · 01-20-2018, 07:38 AM

Hello,

I have a script which doesn't work, and I can't get to know why. Can you help me please ?

My script takes MIB values and put them in a tab. I want to take the third value, 10 times, and get an average of it.

My tab returns for example : 6202 0 17384 0

Here is the script :

Code:

#!/bin/bash


MIB=1.3.6.1.2.1.2.2.1.11 


i=0
total=0

while [ $i -le 10 ]
do
	tab=$(snmpwalk -v1 localhost -c public $MIB | cut -d' ' -f 4)
	
	$total=$(($total + ${tab[2]}))
done


echo $(($total / 10))

I might well try to print only ${tab[2]}, but all I have is an empty line, though ${tab[*]} does print the full tab :

Can you help me debug it please ?

pan64 · 01-20-2018, 08:05 AM

tab=( $(snmpwalk .... ) )
or if that won't work see mapfile and check probably here: https://stackoverflow.com/questions/...-array-in-bash

by the way you can try to use shellcheck to check your script.

Acnologia · 01-20-2018, 08:38 AM

Indeed it worked. It was all about brackets. Thank you !
And thanks for shellcheck !