Very simple script to monitor RAM usage on linux machine

ram-monitor

#!/bin/sh
# Using /bin/sh which is guaranteed to be present on any posix system.
# If you want to add shell specific parts in the script than replace this.
# E.g. if you want to use bash specific stuff then change it to:
# #!/usr/bin/env bash
# Make sure that the shebang is on the first line of the script (no comments above it!)

# While true, pause 5 seconds, then append information to Mylogfile
# 
# Usage: ./ram-monitor.sh >> logfile &
#
while ( sleep 5 ); do echo "\n=================================" ; date ; free -m ; echo "===================================" ; done