Example of a bash function with named parameters+defaults

bash_default_named_params.sh

interactive_gpu()
{
    # needed by getopt: https://stackoverflow.com/a/5048356
    local OPTIND

    # default parameter values
    seconds=300
    partition="large"

    # parse flags to optionally override param defaults
    while getopts "p:t:" f; do
        case "${f}" in
            p)
              	partition=${OPTARG}
                ;;
            t)
              	seconds=${OPTARG}
                ;;
        esac
    done
    shift $((OPTIND-1))

    # parameter transformations, when needed
    timestamp=$(date -d@${seconds} -u +%H:%M:%S)  # convert seconds to hh:mm:$

    # print and execute main call
    cmd="srun --partition=${partition} --nodes=1 --ntasks-per-node=1 --cpus-per-task=8 --mem=45GB --gres=gpu:1 --time=${timestamp} --pty bash -i"
    echo $cmd
    eval "$cmd"
}