Script for watch a web site changes.

watch_web.sh

#! /bin/bash

TMP_SAVE_DIR="/home/ --"
TARGET_URL="http://"
TARGET_FILE="target"
TARGET_FILE_TMP="target.tmp"

if [ ! -d ${TMP_SAVE_DIR} ]; then
    mkdir -p ${TMP_SAVE_DIR}
    if [ $? != 0 ]; then
        echo "[Error] Create ${TMP_SAVE_DIR} failed" >&2
        exit 1
    fi
    echo "[Info] Create ${TMP_SAVE_DIR}"
fi

cd ${TMP_SAVE_DIR}
wget -O "${TARGET_FILE_TMP}" "${TARGET_URL}" 2> /dev/null
if [ $? != 0 ]; then
    echo "[Error] Wget ${TARGET_FILE_TMP} was failed." >&2
    exit 1
fi
echo "[Info] Downloaded ${TARGET_FILE_TMP}."


if [ ! -f "${TARGET_FILE}" ] || ! diff ${TARGET_FILE} ${TARGET_FILE_TMP} > /dev/null; then
    echo "[Info] ${TARGET_FILE} was updated."
    echo "[Info] Exec."

    ##  
    #   Do somethind 
    ##  

    if [ $? != 0 ]; then
        echo "[Error] exec failed." >&2
        exit 1
    fi  
else
    echo "[Info] ${TARGET_FILE} was NOT updated."
fi

mv ${TARGET_FILE_TMP} ${TARGET_FILE}
echo "[Info] Finish."