Example of how to use named params in bash

named_params_example.sh

#!/bin/bash

#
# Use like:
# ./this-script.sh --container_name yourcontainername
#

printf '%s\n' "[NOTE] We assume you have a 'Dockerfile' at the root of this project"

container_name=${container_name:-}

# This allows us to use named params
while [ $# -gt 0 ]; do
    if [[ $1 == *"--"* ]]; then
        param="${1/--/}"
        declare $param="$2"
    fi
    shift
done

if [ -z "$container_name" ]; then
    printf '%s\n' "[ERROR] '--container_name' parameter not found! Please supply a container name like: ./this-script.sh --container_name yourcontainername"
else
    #
    # DO WORK
    #
fi