Shows System Uptime

show_uptime.sh

function show_ut {
	last -F $USER |
	grep ":0 .* :0" |
	sed 's/\s\s*/ /g' |
	cut -d" " -f4-15 | 
	grep $(LANG=en_US date "+%b") | 
	grep -v "(00:00)"

	asd=$(last -F $USER | 
	      grep ":0 .* :0" | 
	      sed 's/\s\s*/ /g' |
              grep $(LANG=en_US date "+%b") | 
              awk '{ print $NF }' | 
              grep -v "(00:00)" | 
              grep -o "[0-9]\+:[0-9]\+")

	counter=0	
	
	for i in $asd
	  do
	     	minutes=$(echo $i | awk -F: '{ print ($1 * 60) + $2 }')
		counter=$(expr $counter + $minutes) 
	 done
	
	((hour=$counter/60))
	((min=$counter-$hour*60))
	
	h=$(printf "%.2i\n" $hour)
	m=$(printf "%.2i\n" $min)
	echo =================
	echo Finally: $h:$m
}

# Example

# [user@mashine ~]$ show_ut
# Wed Oct 23 10:59:53 2013 - Wed Oct 23 14:55:22 2013  (03:55)   
# Mon Oct 21 13:54:56 2013 - Mon Oct 21 17:37:16 2013  (03:42)   
# Mon Oct 21 13:13:10 2013 - Mon Oct 21 13:54:45 2013  (00:41)   
# Wed Oct 16 09:24:07 2013 - Wed Oct 16 16:43:55 2013  (07:19)   
# Thu Oct 10 09:50:17 2013 - Thu Oct 10 12:27:32 2013  (02:37)   
# Thu Oct 10 09:48:13 2013 - Thu Oct 10 09:50:09 2013  (00:01)   
# Tue Oct  8 12:47:36 2013 - Tue Oct  8 17:06:13 2013  (04:18) 
# Mon Oct  7 10:24:32 2013 - Mon Oct  7 17:35:38 2013  (07:11) 
# Wed Oct  2 09:31:33 2013 - Wed Oct  2 11:56:19 2013  (02:24) 
# Tue Oct  1 12:05:10 2013 - Tue Oct  1 17:09:41 2013  (05:04) 
# =================
# Finally: 37:12