#!/bin/bash

date=`date`
load=`cat /proc/loadavg | awk '{print $1}'`
root_usage=`df -h / | awk '/\// {print $(NF-1)}'`
memory_usage=`free -m | awk '/Mem/ { printf("%3.1f%%", $3/$2*100) }'`
memory_free=`free -m | head -n 2 | tail -n 1 | awk {'print $4'}`
swap_usage=`free -m | awk '/Swap/ { printf("%3.1f%%", $3/$2*100) }'`
users=`users | wc -w`
processes=`ps aux | wc -l`

let upSeconds="$(/usr/bin/cut -d. -f1 /proc/uptime)"
let secs=$((${upSeconds}%60))
let mins=$((${upSeconds}/60%60))
let hours=$((${upSeconds}/3600%24))
let days=$((${upSeconds}/86400))

echo "System information as of: $date"
echo
printf "System load:\t%s\tMemory usage:\t%s (free: %sMb)\n" $load $memory_usage $memory_free
printf "Usage on /:\t%s\tSwap usage:\t%s\n" $root_usage $swap_usage
printf "Local users:\t%s\tProcesses:\t%s\n" $users $processes
printf "System uptime:\t%d days, %02dh %02dm %02ds" "$days" "$hours" "$mins" "$secs"
echo