Learn X By Example
Learn X By Example

    Go by Example: Command-Line Arguments

    Go by Example : Command-Line Arguments

    Command-line arguments are a common way to parameterize execution of programs. For example, go run hello.go uses run and hello.go arguments to the go program.

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

    os.Args provides access to raw command-line arguments. Note that the first value in this slice is the path to the program, and os.Args[1:] holds the arguments to the program.

        argsWithProg := os.Args
    argsWithoutProg := os.Args[1:]

    You can get individual args with normal indexing.

        arg := os.Args[3]
        fmt.Println(argsWithProg)
    fmt.Println(argsWithoutProg)
    fmt.Println(arg)
}

    To experiment with command-line arguments it’s best to build a binary with go build first.

    $ go build command-line-arguments.go
$ ./command-line-arguments a b c d
[./command-line-arguments a b c d]       
[a b c d]
c

    Next we’ll look at more advanced command-line processing with flags.

    Next example: Command-Line Flags .

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