Get exit code - Go

Question

I\'m using the package: os/exec http://golang.org/pkg/os/exec/ to execute a command in the operating system but I don\'t seem to find the way to get the exit code. I can rea

Answer 1

September 2019, Go 1.13 introduced errors.As which supports error "unwrapping" - handy for finding precise errors in a nested call-chain.

So to extract and inspect the two most common errors when running an external command:

• os.PathError
• exec.ExitError

---

err := cmd.Run()

var (
    ee *exec.ExitError
    pe *os.PathError
)

if errors.As(err, &ee) {
    log.Println("exit code error:", ee.ExitCode()) // ran, but non-zero exit code

} else if errors.As(err, &pe) {
    log.Printf("os.PathError: %v", pe) // "no such file ...", "permission denied" etc.

} else if err != nil {
    log.Printf("general error: %v", err) // something really bad happened!

} else {
    log.Println("success!") // ran without error (exit code zero)
}