#!/bin/sh
# mfree --- show linux memory statistics
# Author: Noah Friedman <friedman@splode.com>
# Created: 2009-07-17
# Public domain

# $Id: mfree,v 1.1 2009/07/18 00:59:56 friedman Exp $

# Commentary:

# This script prints a report on memory statistics similar to the
# util-linux-ng "free" command.  The main differences are:
#
#   * It gets rid of the obsolete "shared" column
#   * It always prints the "Total" row.  No "-t" flag.
#   * Unlike the busybox variant, it shows the -/+ buffers/cache line.
#
# The only external command this script depends on is the coreutils/busybox
# "printf" command, for formatting.  I can't stand the idea of inlining that.

# Code:

# For android busybox; should be harmless elsewhere
PATH=/system/xbin/bb:$PATH

op=* factor=1
case $1 in
  -b* ) op=* factor=1024 ;;
  -k* ) ;; # default
  -m* ) op=/ factor=1024 ;;
  -g* ) op=/ factor=$((1024 * 1024)) ;;
esac

exec < /proc/meminfo
while read key val ign ; do
  case $key in
    *'('* ) continue ;;
  esac
  key=${key%:}
  val=$((val $op factor))
  eval $key=$val
done

  MemUsed=$((MemTotal - MemFree))
MemNCFree=$((MemFree + Buffers + Cached))
   MemUNC=$((MemUsed - Buffers - Cached))
 SwapUsed=$((SwapTotal - SwapFree))

    Total=$((MemTotal + SwapTotal))
TotalUsed=$((MemUsed  + SwapUsed))
TotalFree=$((MemFree  + SwapFree))

  fmt="%-6s%12s%11s%11s%11s%11s\n"
fmtbc="%-0s%11s%11s%11s%11s%11s\n"

printf "$fmt"   ""             total       used       free    buffers     cached
printf "$fmt"   Mem:       $MemTotal   $MemUsed   $MemFree   $Buffers    $Cached
printf "$fmtbc" "-/+ buffers/cache:"    $MemUNC $MemNCFree
printf "$fmt"   Swap:     $SwapTotal  $SwapUsed  $SwapFree
printf "$fmt"  Total:         $Total $TotalUsed $TotalFree

# eof