A simple Ruby script to gather and display uptime, load average, memory usage, and network activity.

server_stats.rb

require 'time'

now = Time.now

boottime = `/usr/sbin/sysctl kern.boottime`
begin
	timestamp = boottime.split(/\}/).last
	
	boot = Time.parse(timestamp)

	@days_uptime = ((now.to_i - boot.to_i) / (24 * 60 * 60)).to_s
	@start_uptime = boot.strftime("%d.%b.%Y")
rescue
	@days_uptime = 'Unknown'
	@start_uptime = 'Unknown'
end

loadavg = `/usr/sbin/sysctl vm.loadavg`
begin
	@load_average = loadavg.split[-3]
rescue
	@load_average = 'Unknown'
end

vm_stat = `/usr/bin/vm_stat`
begin
	lines = vm_stat.split(/$/)
	free_pages = lines[1].split[-1].to_i
	active_pages = lines[2].split[-1].to_i
	inactive_pages = lines[3].split[-1].to_i
	wired_pages = lines[4].split[-1].to_i

	used_pages = wired_pages + active_pages
	total_pages = free_pages + active_pages + inactive_pages + wired_pages
	
	@memory_usage = sprintf('%.0f%%', (used_pages.to_f / total_pages.to_f) * 100.0)
rescue
	@memory_usage = 'Unknown'
end

swapusage = `/usr/sbin/sysctl vm.swapusage`
begin
	md = swapusage.match(/(\d+\.\d+)\D+(\d+\.\d+)\D+(\d+\.\d+)/)

	swap_megabytes = md[2].to_f
	@swap_usage = sprintf('%.2f GB', swap_megabytes / 1024)
rescue
	@swap_usage = 'Unknown'
end

netstat = `/usr/sbin/netstat -I en0 -b`
begin
	lines = netstat.split(/$/)
	link = lines[1].split
	link_bytes_in = link[-5].to_f rescue 0
	link_bytes_out = link[-2].to_f rescue 0
	@link_in = sprintf('%.2f GB', link_bytes_in / 1024 / 1024 / 1024)
	@link_out = sprintf('%.2f GB', link_bytes_out / 1024 / 1024 / 1024)
rescue
	@link_in = 'Unknown'
	@link_out = 'Unknown'
end

puts "Uptime:  " + @days_uptime + " days (since " + @start_uptime + ")"
puts "Load:    " + @load_average
puts "Memory:  " + @memory_usage + " (" + @swap_usage + " swapped)"
puts "Network: " + @link_in + " in, " + @link_out + " out"

It generates a short summary like this:

Uptime:  11 days (since 27.Mar.2026)
Load:    1.66
Memory:  50% (0.00 GB swapped)
Network: 8.18 GB in, 0.67 GB out