How to modify the value of exported variable in logtash file

Elastic Stack Logstash
1

I have one variable in shell script and exported it and I want to increase( by 1) the value of this variable in filter block of logstash file .

I have one variable in shell script (ksh file)
export f=0

logstash file
f += 1

it's not increased.
It would be very helpful if someone looks into it.

2

What you're trying to do just won't work. What underlying problem are you trying to solve? Without background information we won't be able to make any suggestions.

3

simply I have exported one variable(flag) in ksh file and intialized by 0.

ksh file
export flag = 0

now I want to increase the value of flag in filter block of logstash file ..
because in fliter block I have one condition.

logstash file
filter
{
ruby {
code => "
if flag == 0
puts 'one time execution.
end

flag +=1

"
}
}

conclusion is we need to print (puts 'one time execution.) statement once.

hope I explained in better way.

4

conclusion is we need to print (puts 'one time execution.) statement once.

Why? What end goal are you trying to reach?

5

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