bin/cpu

#!/bin/sh
#
# z3bra - (c) wtfpl 2014

usage () {
    cat <<EOF
usage: $(basename $0) [-hp]
    -h : print help
    -p : percentage of cpu used (default)
    -n : number of running processes
EOF
}

cpuperc () {
    LINE=`ps -eo pcpu |grep -vE '^\s*(0.0|%CPU)' |sed -n '1h;$!H;$g;s/\n/ +/gp'`

    echo "`echo $LINE | bc`%"
}

cpunumb() {
    ls /proc | grep -oE '^[0-9]*$' | wc -w
}

case $1 in
    -h) usage;;
    -n) cpunumb;;
     *) cpuperc;;
esac