#!/bin/bash

function filesize {
    awk 'BEGIN{ x = '$1'
        split("K M G T P",type)
        for(i=5;y < 0.1;i--)
            y = x / (2^(10*i))
        str=int(y*10)/10 type[i+2] 
        if (x==0) { str = "0" }
        print str
    }' || return $?
}

function shorttime {
        awk 'BEGIN{ x = '$1'
        split("s m h d",type)
        split("1 60 3600 86400",divisor)
        for(i=4;y < 1;i--)
            y = x / (divisor[i])
        str=int(y) type[i+1] 
        if (x==0) { str = "0" }
        print str
    }' || return $?
    
}

cores=$( grep -c processor /proc/cpuinfo )
load=$( cat /proc/loadavg | cut -d" " -f3 | tr  -d [:cntrl:] )  
echo -n "L:$load/$cores M:" 
     # used + cached = total - free 
free=$( grep ^MemFree /proc/meminfo | tr -d -c [:digit:] )
cache=$( grep ^Cached /proc/meminfo | tr -d -c [:digit:] )
total=$( grep ^MemTotal /proc/meminfo | tr -d -c [:digit:] )
used=$( echo $total $free $cache | awk '{ print $1 -$2 -$3 }' )

used=$( filesize $used )
cache=$( filesize $cache )
total=$( filesize $total )
echo -n "$used+$cache/$total U:" 
ps a --format user| grep -v -e root -e USER | sort -u | wc -l | tr -c -d [:digit:]
printf " R/H:%s/%s" $( df / | awk '{print $5}' | tail -n +2 ) $( df /home | awk '{print $5}' | tail -n +2 )

printf " up:%s" $( shorttime $( cut -d" " -f1 /proc/uptime ) )

# exit okay
true