下面是完整的源代码，你可以查看这个仓库（https:/ /gitlab.com/sj14/gosh/），但源代码有可能已经与本文中展示的代码有所不同。
package main
import (
"bufio"
"errors"
"fmt"
"os"
"os/exec"
"strings"
)
func main() {
reader := bufio.NewReader(os.Stdin)
for {
fmt.Print("> ")
// Read the keyboad input.
input, err := reader.ReadString('\n')
if err != nil {
fmt.Fprintln(os.Stderr, err)
}
// Handle the execution of the input.
err = execInput(input)
if err != nil {
fmt.Fprintln(os.Stderr, err)
}
}
}
// ErrNoPath is returned when 'cd' was called without a second argument.
var ErrNoPath = errors.New("path required")
func execInput(input string) error {
// Remove the newline character.
input = strings.TrimSuffix(input, "\n")
// Split the input separate the command and the arguments.
args := strings.Split(input, " ")
// Check for built-in commands.
switch args[0] {
case "cd":
// 'cd' to home with empty path not yet supported.
if len(args) < 2 {
return ErrNoPath
}
err := os.Chdir(args[1])
if err != nil {
return err
}
// Stop further processing.
return nil
case "exit":
os.Exit(0)
}
// Prepare the command to execute.
cmd := exec.Command(args[0], args[1:]...)
// Set the correct output device.
cmd.Stderr = os.Stderr
cmd.Stdout = os.Stdout
// Execute the command and save it's output.
err := cmd.Run()
if err != nil {
return err
}
return nil
}