AvalonStudio.CommandLineTools.PlatformSupport.ResolveFullExecutablePath C# (CSharp) Method

        public static string ResolveFullExecutablePath(string fileName, bool returnNullOnFailure = true, params string[] extraPaths)
        {
            if (File.Exists(fileName))
                return Path.GetFullPath(fileName);

            if (executorType == ShellExecutorType.Windows)
            {
                var values = new List<string>(extraPaths);
                values.AddRange(new List<string>(Environment.GetEnvironmentVariable("PATH").Split(';')));

                foreach (var path in values)
                {
                    var fullPath = Path.Combine(path, fileName);
                    if (File.Exists(fullPath))
                        return fullPath;
                }
            }
            else
            {
                //Use the which command
                var outputBuilder = new StringBuilder();
                ExecuteShellCommand("which", $"\"{fileName}\"", (s, e) =>
                {
                    outputBuilder.AppendLine(e.Data);
                }, (s,e)=> { }, false);
                var procOutput = outputBuilder.ToString();
                if (string.IsNullOrWhiteSpace(procOutput))
                {
                    return returnNullOnFailure ? null : fileName;
                }
                return procOutput.Trim();
            }
            return returnNullOnFailure ? null : fileName;
        }
    }