What should be passed as the first argument to os.NewFile?

Question

go

https://golang.org/pkg/os/#NewFile
I can't figure out what the first argument is being passed here. did so

os.Mkdir("logs", 0777)
os.NewFile(0777, "logs/err.log")

The compiler does not see errors. The folder is created but the file is not in it. Thanks in advance for your help.

Answer 1

fd - file descriptor. The NewFile function returns a File type with the specified file descriptor and name, but it does not create a new file on the system.
You can use os.OpenFile to create a new file .