Executed piped commands via System.Diagnostics.Process on Mono

Question

Is it possible to execute the following piped commands via System.Diagnostics.Process?

echo "test" | sudo -S shutdown -r +1

I've tried setting the file name to "/bin/bash", with the above as arguments, with no success.

...
var processStartInfo = new ProcessStartInfo { FileName = "/bin/bash", Arguments = "echo \"test\" | sudo -S shutdown -r +1" };
process.StartInfo = processStartInfo;
...

Answer 1

bash is interpreting your command as a file name followed by arguments, meaning it invokes echo and passes all the rest (including the pipe |) to it for printing so you will get test | sudo -S shutdown -r +1 echoed and sudo won't be executed.

You should use the -c option to execute a command. Furthermore, you should quote the command itself so that it gets passed as a single argument. Something like this should work:

var processStartInfo = new ProcessStartInfo
{
    FileName = "/bin/bash",
    Arguments = "-c \"echo test | sudo -S shutdown -r +1\""
};