A simple script to pull & save files from a remote HTTP server

imagepull.sh

#!/bin/bash

# A simple script to pull & save files from a remote HTTP server
# Created by DPE on 11/30/2015
# david@dpedesign.com

IMAGE_URL='http://northernimages.us/cameras/lsmvc2/lsmvc2-800.jpg'
DIR_NAME='lsmvc2'

# Setup Passed Arguments
while [[ $# > 1 ]]
do
key="$1"

case $key in
    -u|--url)
    IMAGE_URL="$2"
    shift # past argument
    ;;
    -d|--directory)
    DIR_NAME="$2"
    shift # past argument
    ;;
    --default)
    DEFAULT=YES
    ;;
    *)
          # unknown option
    ;;
esac
shift # past argument or value
done

DIR_PATH="/home/dpe/dpedesign/LiftBridgeIs/$DIR_NAME"

#echo "$IMAGE_URL"
#echo "$DIR_NAME"
#echo "$DIR_PATH"

# Get the Last-Modified Header for the current remote image
REMOTE_MODIFIED=$(curl -sI "$IMAGE_URL" | sed -n -e 's/^.*Last-Modified: //p')
REMOTE_MODIFIED=$(date -d "$REMOTE_MODIFIED" +"%s")

#Get the Modified timestamp for the lastest saved local image
LOCAL_MODIFIED=$(find "$DIR_PATH" -type f -exec stat -c "%Y" {} + | sort -r | head -1)

#echo "$REMOTE_MODIFIED"
#echo "$LOCAL_MODIFIED"

# If the remote file is newer, get it.
if [ "$REMOTE_MODIFIED" -gt "$LOCAL_MODIFIED" ]; then
    #echo 'get it'
    curl "$IMAGE_URL" -o "$DIR_PATH/$DIR_NAME-$REMOTE_MODIFIED.jpg" -s -L -R
fi