Monitor directory size on a Linux machine using SSH | ActiveXperts Network Monitor

The following script can be used in ActiveXperts Network Monitor to check the directory size on a remote LINUX machine:

#!/bin/bash
#################################################################################
# ActiveXperts Network Monitor - Shell script checks
#
# For more information about ActiveXperts Network Monitor and SSH, please
# visit the online ActiveXperts Network Monitor Shell Script Guidelines at:
#   https://www.activexperts.com/support/network-monitor/online/linux/
#################################################################################
# Script
#     directory-size.sh
# Description
#     Checks the size of a directory in Kilo Bytes
# Declare Parameters
#     1) sDirectory (string) - Directory to check
#     2) nMaxSizeMB (number) - Maximum allowed size of the directory in MB
# Usage
#     directory-size.sh sDirectory nMaxSizeMB
# Sample
#     directory-size.sh /etc/bin/ 30
#################################################################################

# Validate number of arguments
if [ $# -ne 2 ] ; then
  echo "UNCERTAIN: Invalid number of arguments - Usage: directory-size sDirectory nMaxSizeMB"
  exit 1
fi

# Validate numeric parameter nMaxSizeMB
regExpNumber='^[0-9]+$'
if ! [[ $2 =~ $regExpNumber ]] ; then
  echo "UNCERTAIN: Invalid argument: nMaxSizeMB (number expected)"
  exit 1
fi

# Check the size of the directory specified
if [ ! -d "$1" ]; then
  echo "UNCERTAIN: Directory [$1] does not exist"
  exit 0
fi

nSizeKB=`du -s "$1" | awk '{ print $1; }'`
nSizeMB=$( echo "$nSizeKB / 1024" | bc )


# Round a float to an integer value
nRoundSizeMB=$( echo "$nSizeMB / 1" | bc )

# Round a float to an integer value
nRoundMaxMB=$( echo "$2 / 1" | bc )

if [ $nRoundSizeMB -le $nRoundMaxMB ] ; then
  echo "SUCCESS: Size of directory=[$nRoundSizeMB MB], maximum allowed=[$nRoundMaxMB MB] DATA:$nRoundSizeMB"
else
  echo "ERROR: Size of directory=[$nRoundSizeMB MB], maximum allowed=[$nRoundMaxMB MB] DATA:$nRoundSizeMB"
fi

exit 0