Software⏱️ 2 min read📅 2026-05-31

How to Fix: Counter increment in Bash loop not working

The counter is not updating due to the use of subshell in Bash. To fix this, declare COUNTER as an array and increment its value using COUNTER[0]++.

Quick Answer: Replace COUNTER with COUNTER=0; COUNTER[0]=$((COUNTER[0]+1));

The issue you're experiencing is due to the use of subshell in Bash. In Bash, variables are not preserved across lines or subshells. To fix this, you can use command substitution or declare a variable with the declare -A syntax.

🚀 How to Resolve This Issue

Method 1: Using declare -A

  1. Step 1: Declare a variable with the declare -A syntax and assign values to it.

Method 2: Using command substitution

  1. Step 1: Use command substitution to assign values to a variable.

✨ Wrapping Up

By using one of these methods, you can update the COUNTER variable correctly in your Bash script.

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