C#获取Linux磁盘剩余空间

        /// <summary>
        /// Linux获取磁盘剩余空间,单位byte
        /// </summary>
        /// <param name="path">例：/home</param>
        /// <returns></returns>
        public long LinuxGetFolderDiskInfo(string path)
        {
            try
            {
                if (string.IsNullOrEmpty(path))
                {
                    return 0;
                }
                if (!path.StartsWith("/"))
                {
                    path = "/" + path;
                }

                string shellPathLine = string.Format("cd {0}", path);
                string shellLine = string.Format("df {0}", path);

                Process p = new Process();
                p.StartInfo.FileName = "sh";
                p.StartInfo.UseShellExecute = false;
                p.StartInfo.RedirectStandardInput = true;
                p.StartInfo.RedirectStandardOutput = true;
                p.StartInfo.RedirectStandardError = true;
                p.StartInfo.CreateNoWindow = true;
                p.Start();
                p.StandardInput.WriteLine(shellPathLine);
                p.StandardInput.WriteLine(shellLine);
                p.StandardInput.WriteLine("exit");

                string strResult = p.StandardOutput.ReadToEnd();

                string[] arr = strResult.Split('
');
                if (arr.Length == 0)
                {
                    return 0;
                }

                string strArray = arr[1].TrimStart().TrimEnd();

                //把字符串中多个空格合并成一个（overlay         20961280 6256512  14704768  30%）
                while (strArray.IndexOf("  ") > 0)
                {
                    strArray = strArray.Replace("  ", " ");
                }

                string[] resultArray = strArray.Split(' ');
                if (resultArray == null || resultArray.Length == 0)
                {
                    return 0;
                }

                //读取可用空间，单位KB
                long availableSize = Convert.ToInt32(resultArray[3]);

                //KB => byte
                availableSize *= 1024;

                return availableSize;
            }
            catch (Exception ex)
            {
                throw ex;
            }
        }