Learn X By Example
Learn X By Example

    Go by Example: Exit

    Go by Example : Exit

    Use os.Exit to immediately exit with a given status.

    package main
    import (
    "fmt"
    "os"
)
    func main() {

    defer s will not be run when using os.Exit , so this fmt.Println will never be called.

        defer fmt.Println("!")

    Exit with status 3.

        os.Exit(3)
}

    Note that unlike e.g. C, Go does not use an integer return value from main to indicate exit status. If you’d like to exit with a non-zero status you should use os.Exit .

    If you run exit.go using go run , the exit will be picked up by go and printed.

    $ go run exit.go
exit status 3

    By building and executing a binary you can see the status in the terminal.

    $ go build exit.go
$ ./exit
$ echo $?
3

    Note that the ! from our program never got printed.

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    Go by Example: Exec'ing Processes
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