With .NET Core now being a cross-platform framework, it’s very easy to invoke a Bash script from C# codes. It’s not a common practice, but in cases that are lack of a .NET library or REST/rpc API, being able to run a script out-of-process is valuable. So here is a nice extension method that I wrote and found it a joy to call.
| public static class ShellHelper | |
| { | |
| public static Task<int> Bash(this string cmd, ILogger logger) | |
| { | |
| var source = new TaskCompletionSource<int>(); | |
| var escapedArgs = cmd.Replace("\"", "\\\""); | |
| var process = new Process | |
| { | |
| StartInfo = new ProcessStartInfo | |
| { | |
| FileName = "bash", | |
| Arguments = $"-c \"{escapedArgs}\"", | |
| RedirectStandardOutput = true, | |
| RedirectStandardError = true, | |
| UseShellExecute = false, | |
| CreateNoWindow = true | |
| }, | |
| EnableRaisingEvents = true | |
| }; | |
| process.Exited += (sender, args) => | |
| { | |
| logger.LogWarning(process.StandardError.ReadToEnd()); | |
| logger.LogInformation(process.StandardOutput.ReadToEnd()); | |
| if (process.ExitCode == 0) | |
| { | |
| source.SetResult(0); | |
| } | |
| else | |
| { | |
| source.SetException(new Exception($"Command `{cmd}` failed with exit code `{process.ExitCode}`")); | |
| } | |
| process.Dispose(); | |
| }; | |
| try | |
| { | |
| process.Start(); | |
| } | |
| catch (Exception e) | |
| { | |
| logger.LogError(e, "Command {} failed", cmd); | |
| source.SetException(e); | |
| } | |
| return source.Task; | |
| } | |
| } |
To call the method, one can simply do, e.g.:
| await $"scripts/00magic.sh --param {arg}".Bash(this.logger); |
nice one. How can I call a .sh file located somewhere local to this service instead of hard coding a command? I want to run multiple commands and one of them takes input so I want to run it in non-interactive mode.