ActiveXperts Network Monitor
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Monitor memory usage on Linux using an SSH Secure Shell Script

The following script can be used in ActiveXperts Network Monitor to check memory usage on a remote LINUX machine:

#################################################################################
# ActiveXperts Network Monitor  - shell script checks
# © 1999-2008, ActiveXperts Software B.V.
#
# For more information about ActiveXperts Network Monitor and SSH, please
# visit the online ActiveXperts Network Monitor Shell Script Guidelines at:
#   http://www.activexperts.com/support/network-monitor/online/linux/
#################################################################################

#!/bin/sh

# Macro definitiions
FREE=`free -m | awk '/^Mem:/	{ printf( "%s\n", $4 ); }'`
USED=`free -m | awk '/^Mem:/	{ printf( "%s\n", $3 ); }'`

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

# Validate arguments
if [ $1 != "free" ] && [ $1 != "used" ]; then
 echo "ERROR: Invalid parameter: $1  DATA:0";
fi

# Check free memory
if [ $1 == "free" ] ; then
 if [ $FREE -ge $2 ] ; then
	echo "SUCCESS: Free memory is [$FREE MB], minimum required=[$2 MB] DATA:$FREE";
 else
	echo "ERROR: Free memory is [$FREE MB], minimum required=[$2 MB] DATA:$FREE";
 fi	
fi	

# Check used memory
if [ $1 == "used" ] ; then
 if [ $USED -le $2 ] ; then
	echo "SUCCESS: Used memory is [$USED MB], maximum allowed=[$2 MB] DATA:$USED";
 else
	echo "ERROR: Used memory is [$USED MB], maximum allowed=[$2 MB] DATA:$USED";
 fi	
fi