s3 log check for zabbix shell

#!/bin/bash
#
# USAGE:
# <script>.sh <bucketname> <level> <appname>
# ./logs.sh mybucket stage myapp 
#
# Use DEBUG flag to run locally and see debug print lines
# ~/.s3cfg should be set correctly for this to work in non DEBUG mode
# date -d doesnt work on mac osx so watch out for that
#

DEBUG="TRUE"
S3COMMAND_PART=" "

# log things and use local keys for testing, not all versions of s3cmd support --access_key
#
if [ "$DEBUG" == "TRUE" ]; then
  KEY=iamakey
  SECRET=yoursecretheremineisthatilovewafflehouse
  S3COMMAND_PART = " --access_key=$KEY --secret_key=$SECRET "
fi

BUCKETNAME=$1
LEVEL=$2
S3APPNAME=$3
TODAY=$(date +"y=%Y/m=%m/d=%d")
YESTERDAY=$(date --date="1 day ago"  +"y=%Y/m=%m/d=%d")
BUCKET_TODAY="s3://$BUCKETNAME/$LEVEL/$S3APPNAME/$TODAY/"
BUCKET_YESTERDAY="s3://$BUCKETNAME/$LEVEL/$S3APPNAME/$YESTERDAY/"

log() {
  if [ "$DEBUG" == "TRUE" ]; then
    echo $1
  fi
}

log " $BUCKETNAME : $LEVEL : $S3APPNAME "
log $TODAY
log $YESTERDAY
log $BUCKET_TODAY
log $BUCKET_YESTERDAY

# if we dont have any from today, check yesterday, we might be on a date boundry
#
LARGEST=$(s3cmd ls $BUCKET_TODAY $S3COMMAND_PART -v | awk 'BEGIN {max = 0} {if ($1$2>max) max=$1" "$2} END {print max}')
if [ LARGEST = "0" ]; then
    LARGEST=$(s3cmd ls $BUCKET_YESTERDAY $S3COMMAND_PART -v | awk 'BEGIN {max = 0} {if ($1$2>max) max=$1" "$2} END {print max}')
fi
log $LARGEST

# date -d doesnt work on OSX
LARGEST_S=$(date -d"$LARGEST" +%s)
NOW_S=$(date +%s)
log $LARGEST_S
log $NOW_S

# ANSWER
echo $(( $NOW_S - $LARGEST_S ))