github.com/u-root/u-root@v7.0.1-0.20200915234505-ad7babab0a8e+incompatible/cmds/exp/ash/exit.go (about)

     1  // Copyright 2017 the u-root Authors. All rights reserved
     2  // Use of this source code is governed by a BSD-style
     3  // license that can be found in the LICENSE file.
     4  
     5  package main
     6  
     7  import (
     8  	"errors"
     9  	"os"
    10  	"strconv"
    11  )
    12  
    13  func init() {
    14  	addBuiltIn("exit", exitBuiltin)
    15  }
    16  
    17  func exitBuiltin(c *Command) error {
    18  	var err error
    19  	if len(c.argv) == 0 {
    20  		os.Exit(0)
    21  	} else if len(c.argv) > 1 {
    22  		err = errors.New("Too many arguments")
    23  	} else if ret, err2 := strconv.Atoi(c.argv[0]); err2 == nil {
    24  		os.Exit(ret)
    25  	} else {
    26  		err = errors.New("Non numeric argument")
    27  	}
    28  	return err
    29  }