get system total memory in ruby

One way to get the total memory of the system in Ruby is to use a system command to execute a shell command. There are several ways to do this, but one common approach is to use the sys/proctable gem. Here's an example:

main.rb
require 'sys/proctable'

mem_info = Sys::ProcTable.meminfo
total_mem = mem_info['MemTotal']

puts "Total memory: #{total_mem} KB"
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This code uses the Sys::ProcTable.meminfo method to get information about the system's memory usage, and then retrieves the MemTotal value from the resulting hash. This value is in kilobytes, so the code prints it out with that unit.