在运行时在Go应用程序中设置值

Question

I'm writing a go application that writes values to a file.

However, I want the location of that file to be determined at runtime (i.e. not set as part of the application code).

I have create a test client for the application and I want the client to tell the application which file it should write to.

Can anyone tell me how I would go about this in Go?

Thanks,

Sean

Answer 1

If the location is not set, you'll need to read it in some way.

• You might want to read it from a command line flag passed in when running the command. The easiest way to do that is using the flag package.
• You could read it from STDIN. The top answer to this question nicely explains how to do that.
• You could read it from an environment variable. Check out the Environ function in the os package.