Return the average memory size of httpd processes running on a server

httpd_avg_size.bash

#!/bin/bash

# --------------------------------------------------------------------------
# Script     : httpd_avg_mem_size
# Created on : 27/07/2015
# Copyright  : (c) 2015 - fdsolutions
# --------------------------------------------------------------------------


usage(){
        echo "Usage: httpd_avg_mem_size [-s SIZE]

    -s SIZE : Set the memory size to Kilobyte(K), Megabyte(M), Gigabyte(K)
"
}


get_httpd_mem_size() {
        local size=${1:-K}
        local avgMemSize="$(ps aux | grep 'httpd' | awk '{print $6;}' | awk '{avg += ($1 - avg) / NR;} END {print avg;}')"

        if [[ $? != "0" ]]; then
                return 1
        fi;

        case $size in
                M) memSize=$(echo $avgMemSize | awk '{print $1/1024}' );;
                G) memSize=$(echo $avgMemSize | awk '{print $1/1024/1024}' );;
                *) memSize=$avgMemSize ;;
        esac

        echo $memSize
        return 0
}



unset OPTIND
while getopts ":s:" option; do
        case $option in
        s) optionSize=$OPTARG ;;
  esac
done && shift $(($OPTIND - 1))


get_httpd_mem_size $optionSize