top -bn1 | grep "Cpu(s)" | \
sed "s/.*, *\([0-9.]*\)%* id.*/\1/" | \
awk '{print 100 - $1"%"}'
htop
# or
gnome-system-monitor
# or
topcat /proc/cpuinfoawk '{u=$2+$4; t=$2+$4+$5; if (NR==1){u1=u; t1=t;} else print ($2+$4-u1) * 100 / (t-t1) "%"; }' \
<(grep 'cpu ' /proc/stat) <(sleep 1;grep 'cpu ' /proc/stat)
You can still do this in top.
Run the `top` command, and then press '1' on your keyboard. This will show CPU usage per core.
Limit the processes shown by having that specific process run under a specific user account and use Type 'u' to limit to that user