Get Unix Memory

[whuanle]

no unsupport Alpine Linux!

    private MemoryMetrics GetUnixMetrics()
    {
        var output = "";
 
        var info = new ProcessStartInfo("free -m");
        info.FileName = "/bin/bash";
        info.Arguments = "-c \"free -m\"";
        info.RedirectStandardOutput = true;
        
        using(var process = Process.Start(info))
        {                
            output = process.StandardOutput.ReadToEnd();
            Console.WriteLine(output);
        }
 
        var lines = output.Split("\n");
        var memory = lines[1].Split(" ", StringSplitOptions.RemoveEmptyEntries);
    
        var metrics = new MemoryMetrics();
        metrics.Total = double.Parse(memory[1]);
        metrics.Used = double.Parse(memory[2]);
        metrics.Free = double.Parse(memory[3]);
 
        return metrics;            
    }