HelperClass.cs

using System;
using System.Diagnostics;
using System.Text;

namespace ddb
{
    /// <summary>
    /// reference
    /// https://loune.net/2017/06/running-shell-bash-commands-in-net-core/
    /// </summary>
    public static class HelperClass
    {
        public static bool Bash(this StringBuilder cmd)
        {
            try
            {
                using Process process = new Process()
                {
                    StartInfo = new ProcessStartInfo
                    {
                        FileName = "/bin/sh",
                        Arguments = $"-c \"{cmd.Replace("\"", "\\\"")}\"",
                        RedirectStandardOutput = true,
                        RedirectStandardError = true,
                        UseShellExecute = false,
                        CreateNoWindow = true
                    }
                };
                process.Start();
                string standardError = process.StandardError.ReadToEnd();
                process.WaitForExit();

                if (string.IsNullOrEmpty(standardError.Trim()))
                {
                    return true;
                }
                else
                {
                    throw new Exception(standardError);
                }
            }
            catch (Exception)
            {
                throw;
            }
        }

        public static String BytesToString(this long byteCount)
        {
            string[] suf = { "B", "KB", "MB", "GB", "TB", "PB", "EB" };
            if (byteCount == 0)
                return "0" + suf[0];
            long bytes = Math.Abs(byteCount);
            int place = Convert.ToInt32(Math.Floor(Math.Log(bytes, 1024)));
            double num = Math.Round(bytes / Math.Pow(1024, place), 1);
            return (Math.Sign(byteCount) * num).ToString() + suf[place];
        }
        public static int GetMilisecund(int hour, int minute)
        {
            DateTime firstStart = DateTime.Today.AddHours(hour).AddMinutes(minute);
            if (hour < DateTime.Now.Hour || hour == DateTime.Now.Hour && minute < DateTime.Now.Minute)
            {
                firstStart = firstStart.AddDays(1);
            }

            TimeSpan span = firstStart - DateTime.Now;

            return (int)span.TotalMilliseconds;
        }
    }
}