making os specifix changes

src/System.Diagnostics.Process/src/System/Diagnostics/Process.Linux.cs

@@ -57,6 +57,62 @@ internal DateTime StartTimeCore
             }
         }
 
+        /// <summary>Gets arguments.</summary>
+        /// <param name="startInfo">The start info with which to start the process.</param>
+        private string[] GetArgs(ProcessStartInfo startInfo)
+        {
+            string[] argv;
+
+            if (startInfo.UseShellExecute)
+            {
+                argv = new string[3] { GetExecPath(), "-c", startInfo.FileName + " " + startInfo.Arguments};
+            }
+            else
+            {
+                argv = ParseArgv(startInfo);
+            }
+
+            return argv;
+        }
+
+        /// <summary>Gets execution path</summary>
+        private string GetExecPath()
+        {
+            string[] allowedProgramsToRun = { "xdg-open", "gnome-open", "kfmclient" };
+            string pathToProgram = string.Empty;
+
+            foreach (var program in allowedProgramsToRun)
+            {
+                pathToProgram = GetPathToProgram(program);
+                if (!string.IsNullOrEmpty(pathToProgram))
+                {
+                    return pathToProgram + "/" + program;
+                }
+            }
+
+            return "/bin/sh";
+        }
+
+        /// <summary>
+        /// Gets the path to the program
+        /// </summary>
+        /// <param name="program"></param>
+        /// <returns></returns>
+        private string GetPathToProgram(string program)
+        {
+            string path = Environment.GetEnvironmentVariable("PATH");
+            string[] dirs = path.Split(":");
+            foreach (var dir in dirs)
+            {
+                string[] files = Directory.GetFiles(dir, program);
+                if (files.Length != 0)
+                {
+                    return dir;
+                }
+            }
+            return string.Empty;
+        }
+
         /// <summary>
         /// Gets the amount of time the associated process has spent utilizing the CPU.
         /// It is the sum of the <see cref='System.Diagnostics.Process.UserProcessorTime'/> and

src/System.Diagnostics.Process/src/System/Diagnostics/Process.OSX.cs

@@ -88,6 +88,30 @@ internal DateTime StartTimeCore
             }
         }
 
+        /// <summary>Gets arguments.</summary>
+        /// <param name="startInfo">The start info with which to start the process.</param>
+        private string[] GetArgs(ProcessStartInfo startInfo)
+        {
+            string[] argv;
+
+            if (startInfo.UseShellExecute)
+            {
+                argv = new string[3] { GetExecPath(), "--args", startInfo.FileName + " " + startInfo.Arguments};
+            }
+            else
+            {
+                argv = ParseArgv(startInfo);
+            }
+
+            return argv;
+        }
+
+        /// <summary>Gets execution path</summary>
+        private string GetExecPath()
+        {
+            return "/usr/bin/open";
+        }
+
         /// <summary>
         /// Gets the amount of time the associated process has spent utilizing the CPU.
         /// It is the sum of the <see cref='System.Diagnostics.Process.UserProcessorTime'/> and

src/System.Diagnostics.Process/src/System/Diagnostics/Process.Unix.cs

@@ -233,10 +233,10 @@ private bool StartCore(ProcessStartInfo startInfo)
                     throw new InvalidOperationException(SR.CantRedirectStreams);
                 }
 
-                const string ShellPath = "/bin/sh";
+                var ShellPath = GetExecPath();
 
                 filename = ShellPath;
-                argv = new string[3] { ShellPath, "-c", startInfo.FileName + " " + startInfo.Arguments};
+                argv = GetArgs(startInfo);
             }
             else
             {