Script to download a ZED calibration file

dl_zed_calib.sh

#!/usr/bin/env bash

usage() {
    echo "This script needs the serial number as argument like this :"
    echo "bash dl_zed_calib.sh 1010 [path/]"
    exit 1
}

conf_path="/usr/local/zed/settings/"

# Check the input (serial number and the optional path, ending with '/')
if [ "$#" -eq 2 ] || [ "$#" -eq 1 ]; then
    if [[ "$1" =~ ^[0-9]+$ ]]; then # serial is a number
        if [ "$#" -eq 2 ]; then # custom path given
            if [[ "$2" == */ ]]; then # path ends with a "/"
                conf_path="${2}"
            else
                echo "Invalid path (must end with '/')"
            fi
        fi
        echo "Calibration file will be saved in ${conf_path}"
    else
        echo "Invalid serial number"
        usage
    fi
else
    echo "Invalid parameters"
    usage
fi

serial_number="${1}"
conf_file="${conf_path}SN${serial_number}.conf"

echo "Trying to download SN${serial_number}.conf..."
# Unlikely `curl` options found by @nesnes
curl --silent -L "https://www.stereolabs.com/developers/calib/?SN=${serial_number}" -A "Mozilla/4.0" -o "${conf_file}" --compressed

# Check if the file is valid
if grep --silent "ERROR" "${conf_file}"
then
    echo "The serial seems invalid"
    rm "${conf_file}"
else
    echo "Calibration file correctly downloaded !"
fi