Mail bei Änderung an einem Share

##### mail to users when defined folder has been modified.
##### If the defined folder has not been modified, an email can be sent to the admin by setting SEND_UNCHANGED to 1.
##### Comparison lists can be recursive or not, depending on RECURSIVE_LIST parameter value.
##### Comparison is only performed on file names, and not contents.
##### During the first run, creates lists for comparison and store them in '/homes/admin/_nasData_scripts' folder (see REP_DATA parameter)
##### TODO: send diffence list as attachment, as too large string sent in mail body can cause empty mail!
##### ------------------------------------ user's parameters
EXPLORE_FOLDER="/share/bla/"
# Separate multiple users by comma in USERS_MAIL_LIST. Example: "user1@domain1.com,user2@domain2.com"
USERS_MAIL_LIST=""
ADM_MAIL=""
FROM_MAIL=""
RECURSIVE_LIST=1
SEND_UNCHANGED=0
HNAME=${HOSTNAME}
TMPFILE=/share/muh/diffmail.txt
##### ------------------------------------ advanced parameters
REP_DATA="/share/bla"
FOLDER_SHORT_NAME=$(echo $(basename "$EXPLORE_FOLDER"))
CURR_FILE="_"${FOLDER_SHORT_NAME//[,; :*+&#~\/\"\'\(\)\\]/}"_curr_list.txt"
PRIOR_FILE="_"${FOLDER_SHORT_NAME//[,; :*+&#~\/\"\'\(\)\\]/}"_prior_list.txt"
EMAIL_TITLE="NAS - Folder \'$FOLDER_SHORT_NAME\' analysis"
EMAIL_INTRO="[ This is an automatic email sent from the NAS to all users ]
"
##### ------------------------------------
USERS_MAIL_LIST="$ADM_MAIL,$USERS_MAIL_LIST"
RESULT_ALL=""
RESULT_ADM=""
# --------- collecte des paramètre pour retour admin
PARAMS="Parameters:
    EXPLORE_FOLDER: $EXPLORE_FOLDER
    FOLDER_SHORT_NAME: $FOLDER_SHORT_NAME
    REP_DATA: $REP_DATA
    CURR_FILE: $CURR_FILE
    PRIOR_FILE: $PRIOR_FILE
    RECURSIVE_LIST: $RECURSIVE_LIST
    SEND_UNCHANGED: $SEND_UNCHANGED"
# --------- creation REP_DATA pour fichiers CURR_FILE & PRIOR_FILE
/bin/echo -e "Subject: [$HNAME] - Difference for $REP_DATA" > "$TMPFILE"
/bin/echo -e "To: $USERS_MAIL_LIST" >> "$TMPFILE"
/bin/echo -e "From: $FROM_MAIL" >> "$TMPFILE"
/bin/echo -e "" >> "$TMPFILE"
mkdir -p "$REP_DATA"
if [ ! -d "$REP_DATA" ]; then
    /bin/echo -e "Error : unable to create $REP_DATA folder!" >> "$TMPFILE"
    /usr/sbin/sendmail -v -t < $TMPFILE
    exit
fi
if [ ! -d "$EXPLORE_FOLDER" ]; then
    RESULT_ADM="NAS folder \'$FOLDER_SHORT_NAME\' error.
Unable to locate folder \'$EXPLORE_FOLDER\'

$PARAMS"
    /usr/sbin/sendmail -r "mail('$ADM_MAIL', '$EMAIL_TITLE: error', '$RESULT_ADM', 'From: $FROM_MAIL');";
    exit
fi
# --------- écriture du contenu du dossier passé dans CURR_FILE
if [ "$RECURSIVE_LIST" != 0 ]; then
    ls -R "$EXPLORE_FOLDER"> "$REP_DATA/$CURR_FILE"
else
    ls -R "$EXPLORE_FOLDER"> "$REP_DATA/$CURR_FILE"
fi
# --------- comparaison PRIOR_FILE et CURR_FILE
if [ -f "$REP_DATA/$PRIOR_FILE" ]; then
    # --------- le fichier 'prior' existe : comparaison possible


diff $REP_DATA/$PRIOR_FILE $REP_DATA/$CURR_FILE >> $TMPFILE


    DIFF_LIST=$(diff --ignore-file-name-case"
-------- %dn file%(n=1?:s) added:
%<" --new-group-format="
-------- %dN file%(N=1?:s) deleted:
%>" "$REP_DATA/$CURR_FILE" "$REP_DATA/$PRIOR_FILE") >> $TMPFILE
    if [ "$DIFF_LIST" != "" ]; then
        DATA_TO_SEND=${DIFF_LIST//\'/\\\'}
        DATA_TO_SEND=${DATA_TO_SEND//\"/\\\"}
        RESULT_ALL="NAS folder \'$FOLDER_SHORT_NAME\' has been modified:
-------------------------------------------------------
$DATA_TO_SEND"
    else
        if [ "$SEND_UNCHANGED" != 0 ]; then
            RESULT_ADM="NAS folder \'$FOLDER_SHORT_NAME\' is unchanged.

$PARAMS"
        fi
    fi
else
    # --------- alerte de création des fichiers
    RESULT_ADM="NAS folder \'$FOLDER_SHORT_NAME\' analysis:

File \'$REP_DATA/$CURR_FILE\' has been created.

$PARAMS"

echo "NAS folder \'$FOLDER_SHORT_NAME\' analysis: File \'$REP_DATA/$CURR_FILE\' has been created. $PARAMS" >> $TMPFILE

fi
# ----------- copie de liste actuelle (CURR_FILE) pour comparaison future
cp "$REP_DATA/$CURR_FILE" "$REP_DATA/$PRIOR_FILE"
# ----------- envoi email a l'admin ou aux utilisateurs
if [ "$RESULT_ALL" != "" ]; then
   /usr/sbin/sendmail -v -t < $TMPFILE
else
   /usr/sbin/sendmail -v -t < $TMPFILE
exit
fi