Go Command Line Arguments

When we need to execute a program with some arguments, we generally use command line argument. The arguments passed from the console can be received by the Go program and it can be used as an input.

The os.Args is used to get the arguments. The index 0 of os.Args contains the path of the program.

The os.Args[1:] holds provided arguments.

Go Command Line Argument Example 1

package main

import (
	"fmt"
	"os"
)
func main() {
	var s, arg string
	for i := 1; i < len(os.Args); i++ {
		s += arg + os.Args[i]+" "
	}
	fmt.Println(s)
}

Command to run the program:

go build ProgramName.go
./ProgramName Tom Dick Harry

Output:

Go Command Line Argument Example 2

package main
import "os"
import "fmt"
func main() {
	arumentWithPath := os.Args //returns all arguments including path
	arumentSlice:= os.Args[1:] //returns all elements after path
	arumentAt2 := os.Args[2] //returns specified argument only 
	fmt.Println(arumentWithPath)
	fmt.Println(arumentSlice)
	fmt.Println(arumentAt2)
}

Output:

[/private/var/folders/by/w452m9913bj8_rmgzgjsvw9w0000gn/T/___cmd_go Tom Dick Harry]
[Tom Dick Harry]
Dick

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