GetEnv reads a string value from the environment with the given key.

GetEnvBool reads a string value from the environment with the given key and returns it as bool.

GetEnvFloat32 reads a string value from the environment with the given key and returns it as float32.

GetEnvFloat64 reads a string value from the environment with the given key and returns it as float64.

GetEnvInt reads a string value from the environment with the given key and returns it as int.

GetEnvMap reads all environment variables with the given prefix.