Linux: CPU Usage in percernt

gistfile1.sh

######## USING PS ##########
## Note: In hign loads, it could return more than 100% of load
# Show total %
ps aux | awk {'sum+=$3;print sum'} | tail -n 1
# Debug mode:
ps aux | awk {'value=$3; if ($3 != "0.0") {print "Adding: " value}; sum+=$3;  sumt = "Total sum: " sum;  print sumt'}

####### USING TOP #########
## Note: It needs 2 seconds to execute to be accurrate
top -bn 2 -d 2 | grep '^%Cpu' | tail -n 1 | awk '{print $2+$4+$6 "%"}'

top -bn1 | grep "Cpu(s)" | sed "s/.*, *\([0-9.]*\)%*\ \{0,1\}id.*/\1/" | awk '{print 100 - $1"%"}'