#!/bin/bash

#~ [ $UID = 0 ] || {
   #~ echo Must be run as root
   #~ exit 1
#~ }
function filesize {
# Return a human readable size from integer of bytes
# Usage:  filesize 10000

    [ "$1"  = "0" ] && {
        echo "0 B"
        return 0
    }

    awk 'BEGIN{ x = '$1'
        split("B KB MB GB TB PB",type)
        for(i=5;y < 1;i--)
            y = x / (2^(10*i))
        str=int(y*10)/10 " " type[i+2] 
        if (x==0) { str = "0 B" }
        print str
    }' || return $?
}

# Gather list of last user of machine

LASTUSER=$( who | tail -n 1 | awk '{ print $1 }' )
FULLNAME=$( getent passwd "$LASTUSER" | cut -d ':' -f 5 )
        
DESC_CORES=$( grep -c ^processor /proc/cpuinfo  | tr -d -c [:digit:] )
DESC_TYPE=$( grep -m 1 "model name" /proc/cpuinfo | cut -d: -f2 | sed -e 's/^ *//' )
DESC_MEM=$( grep MemTotal /proc/meminfo | cut -f2 -d: | tr -d -c [:digit:] )
DESC_MEM=$( filesize $(( ${DESC_MEM}*1024 )) )
DESC_VERS=$( lsb_release -r | awk '{print $2}' )
DESC_UP=$( uptime | sed s/,.*// )
DESC_SERIAL=$( dmidecode | grep "Serial Number:" | head -n 1 | cut -d: -f2 | sed -e 's/^ *//' )
DESC="$LASTUSER/$FULLNAME/${DESC_CORES}x ${DESC_TYPE}/RAM ${DESC_MEM}/v.${DESC_VERS}/${DESC_UP}/SN ${DESC_SERIAL}"
echo "$DESC" 

# exit okay
true