instruction: Explain go by example: command-line arguments
output: 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
  .
  by
  Mark McGranaghan
  and
  Eli Bendersky
  |
  source
  |
  license