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.
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| 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.:
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| await $"scripts/00magic.sh --param {arg}".Bash(this.logger); |
Jack Ma, a software developer 
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.
Using this to run commands like “whoami” work great… but when I would like to run commands like “sudo raspi-config nonint get_i2c” – i get raspi-config is an “unknown command”. I know that I’m logged in as root, and when tested via an ssh login to root, the command works fine. Permission issue? Some type of security to stop running these high-level (?) commands?