Bash script that notifies you when you free memory is 100 MB. Shows process ID and name.

memory.sh

#!/bin/bash

MEM=`cat /proc/meminfo | egrep 'MemFree:' |tr -d '[[:space:]]' | sed '$s/..$//' | cut -d ":" -f2`
USER=`whoami`
PID=`ps -ly --User $USER --sort -rss | sed -n '2p' | tr -s [[:blank:]] | cut -d " " -f3`
NAME=`ps -ly --User $USER --sort -rss | sed -n '2p' | tr -s [[:blank:]] | cut -d " " -f13`


if [ $MEM -lt 102400 ]; then
    DISPLAY=:0 notify-send "Low memory. #1 process in RAM usage: $NAME with PID: $PID"
fi