英文:
Golang exec command chmod returning error
问题
熟悉一下Golang，我正在尝试执行shell命令，我需要对任何.pem文件进行chmod操作，所以我决定使用通配符*。
func main() {cmd := exec.Command("chmod", "400", "*.pem")cmd.Stdout = os.Stdoutcmd.Stderr = os.Stdoutif err := cmd.Run(); err != nil {fmt.Println("错误:", err)}}
在执行时，我一直遇到这个错误：
chmod: 无法访问'*.pem': 没有那个文件或目录错误: 退出状态 1
英文:
Familiarizing myself with Golang here and i am trying to execute shell commands, i need to chmod for any .pem file so i decided to use the wildcard *
func main() {cmd := exec.Command( "chmod", "400", "*.pem" )cmd.Stdout = os.Stdoutcmd.Stderr = os.Stdoutif err := cmd.Run(); err != nil {fmt.Println( "Error:", err )}
I keep get this error while executing:
chmod: cannot access '*.pem': No such file or directoryError: exit status 1</details># 答案1**得分**: 5与C和其他语言中的“system”库调用不同，os/exec包有意不调用系统shell，也不展开任何通配符模式或处理其他扩展、管道或重定向，这通常是由shell完成的。因此，在这里，`*`不会被展开。作为解决方法，你应该使用下面的代码来实现：```gocmd := exec.Command("sh", "-c", "chmod 400 *.pem")
英文:
> Unlike the "system" library call from C and other languages, the os/exec package intentionally does not invoke the system shell and does not expand any glob patterns or handle other expansions, pipelines, or redirections typically done by shells.
So here, * will not be expanded. As a workaround, you should use next to make it work:
cmd := exec.Command("sh", "-c", "chmod 400 *.pem" )
答案2
得分: 2
以下是使用os包更改文件权限的另一种方法：
filepath.WalkDir(".", func(filePath string, f fs.DirEntry, e error) error {if e != nil {log.Fatal(e)}if filepath.Ext(f.Name()) == ".pem" {err := os.Chmod(filePath, 0400)if err != nil {log.Fatal(err)}fmt.Println(fmt.Sprintf("成功更改文件权限，文件：%s", filePath))}return nil})
完整的代码可以在 https://play.golang.org/p/x_3WsYg4t52 找到。
英文:
Here is another approach to change a file permission using os package
filepath.WalkDir(".", func(filePath string, f fs.DirEntry, e error) error {if e != nil {log.Fatal(e)}if filepath.Ext(f.Name()) == ".pem" {err := os.Chmod(filePath, 0400)if err != nil {log.Fatal(err)}fmt.Println(fmt.Sprintf("Successfully changed file permission, file: %s", filePath))}return nil})
Complete code can be found at https://play.golang.org/p/x_3WsYg4t52
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