#!/bin/bash

# cpu_watcher.sh
# Meryll Larkin 2014-11-26
# logging for mpstat -P ALL

# cron
# min  hr dy mo dow command
# 0,20,40 * * * * /root/bin/cpu_watcher.sh
#

logdir="/root/bin/CPU_STATS"

mkdir -p $logdir

# we are collecting weekly statistics
# this number is just going to be used to determine
# file name (using modulus 7)
# (date hyphen - do not use leading zero)
day=`date +%-d | tr '\n|\r' ' '`
mth=`date +%-m | tr '\n|\r' ' '`

week=$((day % 7))
mo=$((mth % 3 + 1))
rm_mo=$(($mo + 1))
rm_mo=$(($rm_mo % 3))

# echo "week = $week"
# echo "mo = $mo"
# echo "rm_mo = $rm_mo"

# remove cpu_stats from 3 months ago
# so as not to fill up hd
rm $logdir/cpu_stats_out$rm_mo* 2>/dev/null

cpu_outfile="$logdir/cpu_stats_out$mo$week"

{
date
/usr/bin/mpstat -P ALL
echo ''
echo ''
} >> $cpu_outfile