tmux-mem-cpu-load; usable with Linux or 10.8+ #shell #tmux

tmux-mem-cpu-load.sh

#!/bin/bash

if [ -z $1 ]; then
	echo "Usage: $0 interval [number of lines]"
	exit 1
else
	INTERVAL=$1
fi

NUM_LINES=10
if [ $2 ]; then
	NUM_LINES=$2
fi

calc_lines() {
	if [ $NUM_LINES -gt 0 ]; then
		ACTIVE_LINES=$(($CPU/$NUM_LINES))
		LINES=""
		for (( i = 0; i < $NUM_LINES; i++ )); do
			if [[ $i < $ACTIVE_LINES ]]; then
				LINES="$LINES|"
			else
				LINES="$LINES "
			fi
		done
	fi
}

if [[ $OSTYPE =~ darwin* ]]; then
	# OS X
	cpu_info=$(iostat -n0 -c${INTERVAL} | tail -n1)
	CPU=$(echo $cpu_info | cut -d' ' -f1)
	LOAD=$(echo $cpu_info | cut -d' ' -f4-6)

	mem_info=($(vm_stat))
	WIRED="${mem_info[24]%?}"
	ACTIVE="${mem_info[14]%?}"
	INACTIVE="${mem_info[17]%?}"
	FREE="${mem_info[11]%?}"

	TOTAL_MEM=$(( ($WIRED + $ACTIVE + $INACTIVE + $FREE) * 4096 / 1024 / 1024 ))
	FREE_MEM=$(( ($INACTIVE + $FREE) * 4096 / 1024 / 1024 ))
	USED_MEM=$(( ($WIRED + $ACTIVE) * 4096 / 1024 / 1024 ))
elif [[ $OSTYPE =~ linux* ]]; then
	# Linux
	CPU=$(vmstat 1 ${INTERVAL} | tail -n1 | awk '{print $13}')
	LOAD=$(awk '{print $1,$2,$3}' /proc/loadavg)

	mem_info=($(free -m))
	TOTAL_MEM=${mem_info[7]}
	USED_MEM=${mem_info[15]}
fi

if [ $NUM_LINES -gt 0 ]; then
	calc_lines
	echo "${USED_MEM}/${TOTAL_MEM}MB [${LINES}] ${CPU}% ${LOAD}"
else
	echo "${USED_MEM}/${TOTAL_MEM}MB ${CPU}% ${LOAD}"
fi