top-free-memory

#!/bin/sh
#
# Initial Version 1.0 2009/05/18 14:00:01 BANT
# Anzeige von FREE Memory mit dem TOP Befehl aus SUN OS
#
#%# family=manual


TOP=/usr/local/bin/top

if [ "$1" = "config" ]; then

        echo "graph_title  FREE Memory usage (in MB)"
	echo 'graph_category system'
        echo "free.label Free memory"
        exit 0
fi

# Linjen som grep'es ut kan se ut som dette:
#
# Memory: 16G phys mem, 6030M free mem, 32G swap, 32G free swap

$TOP -n -u | nawk '
function scale(value) {
  if (value ~ /G$/) { sub("G", "", value); value *= 1024 }
  else if (value ~ /M$/) sub("M", "", value)
  else if (value ~ /K$/) { sub("K", "", value); value /= 1024 }
  else value /= 1024 * 1024;
  return value;
}
/^Memory/ {
  free  = scale($5);

  print "free.value", free
}'