ps_mem_check.sh

#!/bin/bash

total_rss=0
total_vsz=0
total_size=0

while read -r size rss vsz user command; do
  total_rss=$((total_rss+rss))
  total_vsz=$((total_vsz+vsz))
  total_size=$((total_size+size))
done <<< $(ps -eo size,rss,vsz,user,command --sort -vsz|grep -v RSS)


mem_free=$(grep ^MemFree /proc/meminfo | sed -n 's/[a-zA-Z]*:\ *\([0-9]*\) kB/\1/p')
mem_avail=$(grep ^MemAvailable /proc/meminfo | sed -n 's/[a-zA-Z]*:\ *\([0-9]*\) kB/\1/p')
mem_buffers=$(grep ^Buffers /proc/meminfo | sed -n 's/[a-zA-Z]*:\ *\([0-9]*\) kB/\1/p')
mem_cached=$(grep ^Cached /proc/meminfo | sed -n 's/[a-zA-Z]*:\ *\([0-9]*\) kB/\1/p')
mem_total=$(grep ^MemTotal /proc/meminfo | sed -n 's/[a-zA-Z]*:\ *\([0-9]*\) kB/\1/p')


cat << EOF
{
  "proc_meminfo": {
    "MemFree": "$mem_free",
    "MemAvailable": "$mem_avail",
    "Buffers": "$mem_buffers",
    "Cached": "$mem_cached",
    "MemTotal": "$mem_total",
    "free_buffers_cached": "$(echo "scale=2; $mem_free + $mem_buffers + $mem_cached" | bc)"
  },
  "ps": {
    "rss": {
      "kb": "$total_rss",
      "mb": "$(echo "scale=2; $total_rss / 1024" | bc)",
      "gb": "$(echo "scale=2; $total_rss / 1024 / 1024" | bc)"
    },
    "vsz": {
      "kb": "$total_vsz",
      "mb": "$(echo "scale=2; $total_vsz / 1024" | bc)",
      "gb": "$(echo "scale=2; $total_vsz / 1024 / 1024" | bc)"
    },
    "size": {
      "kb": "$total_size",
      "mb": "$(echo "scale=2; $total_size / 1024" | bc)",
      "gb": "$(echo "scale=2; $total_size / 1024 / 1024" | bc)"
    }
  }
}
EOF