Puzzlingly different results between using os/exec and executing from the command line

php editor Zimo brings you an analysis of the puzzlingly different results that occur when using the os/exec function in PHP and executing commands on the command line. In practical applications, we may encounter a situation where a command that can be successfully executed on the command line cannot obtain the same result when using the os/exec function. This situation often leaves us confused and difficult to find a solution to. This article will analyze the reasons for you and provide solutions to help you better understand and apply the os/exec function.

Question content

I wrote a program to run commands in golang using package os/exec.

import (
    "fmt"
    "os/exec"
)

func main() {
    cmd := exec.Command("taskkill", "/f /im VInTGui.exe")
    err := cmd.Run()
    if err != nil {
        fmt.Printf("err: %v\n", err)
    }
}

When I run the program, it prints: err: exit status 1

But when I run the command taskkill /f /im vintgui.exe in windows command line. It worked.

Why do running commands through the os/exec package have different results than running commands directly through the windows command line (using the same user and the same permissions)? How can I fix my program?

Solution

The solution is to use the stderr property of the command object. This can be done like this:

cmd := exec.command("taskkill", "/f /im vintgui.exe")
var out bytes.buffer
var stderr bytes.buffer
cmd.stdout = &out
cmd.stderr = &stderr
err := cmd.run()
if err != nil {
    fmt.printf("%v: %s\n", err, stderr.string())
    return
}
fmt.println("result: " + out.string())

According to your situation, just change

exec.command("taskkill", "/f /im vintgui.exe")

to

exec.Command("taskkill", "/f", "/im",  "VInTGui.exe")

Do not combine all parameters into one string.

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