Bash script that automating the process of updating a configuration file based on environment variables

Certainly! Let's write a straightforward Bash script to show how changing a configuration file based on environment variables can be automated.

For the purposes of this illustration, let's imagine you have a configuration file called app_config.conf that needs to be changed with various settings based on the environment (development, testing, production).

Assume you have a configuration file named app_config.conf with the following content:

• app_config.conf

API_URL=
DB_HOST=

#!/bin/bash
config_file="app_config.conf"

if [ $# -ne 3 ]; then
    echo "Usage: $0 <environment> <api_url> <db_host>"
    exit 1
fi

ENVIRONMENT="$1"
api_url="$2"
db_host="$3"

echo "API_URL=$api_url" > "$config_file"
echo "DB_HOST=$db_host" >> "$config_file"

echo "Configuration updated for $ENVIRONMENT environment."

How Do I Use This Script?

1. Make it executable:

chmod +x update_config.sh

1. Run the script:

./update_config.sh development http://dev.api.example.com dev-db.example.com