A sample shell script with parameters

shell-script-args.sh

#!/bin/bash

help()
{
    echo "Invalid Arguments Supplied.."
    echo "############## Use one from below ##############"
    echo "'./run_db.sh --start' for starting MongoDB server"
    echo "'./run_db.sh --stop' for stopping MongoDB server"
    echo "'./run_db.sh --clean' for clean restart of MongoDB server"
}

stop()
{
    echo "Stopping MongoDB.."
    docker-compose down
}

start()
{
    echo "Starting MongoDB.."
    docker-compose up -d
}

clean()
{
    echo "Cleaning MongoDB data directory"
    rm -rf data/*
}

if [ "$1" == "--start" ]
then
    start
elif [ "$1" == "--stop" ]
then
    stop
elif [ "$1" == "--clean" ]
then
    stop
    clean
    start
else
    help
fi