使用 go 获取 shell 名称

Question

I'm running an CLI app and I want to know the user's shell. I tried to use

exec.Command("echo", "$0")

but it logs $0 . Is there a simple way to do this?

Answer 1

You probably want two things:

1. the UID of the current process

2. the configured shell of that UID

os/user can give you the former but after quick searches for 'passwd' or 'pwent' or 'getpwent' (the appropriate libc call) I haven't found a go library that can get you the latter. /etc/passwd is trivial to parse and includes this information once you have the UID, however, so this is what I'd do.

Windows is obviously going to be different, but Darwin might also actually ignore this /etc file and require that you call libc to reach the truth.

It's also conceiveable that your program is always called with some other shell than the configured one, and if this is your concern you'll have to use something like go-ps and trace PPIDs until you find something that you believe to be a shell.