Interacting with the Environment

In this chapter, the following recipes are covered:

• Retrieving the Golang version
• Accessing program arguments
• Creating a program interface with the flag package
• Getting and setting environment variables with default values
• Retrieving the current working directory
• Getting the current process PID
• Handling operating system signals
• Calling an external process
• Retrieving child process information
• Reading/writing from the child process
• Shutting down the application gracefully
• File configuration with functional options