我正在从golang应用程序执行 bash 命令。现在，stdout和stderr直接进入控制台：
cmd.Stdout = os.Stdout
cmd.Stderr = os.Stderr
但我希望stdout并stderr作为字符串变量从runBashCommandAndKillIfTooSlow函数返回，而不立即打印到控制台。如何实施？
编码：
package main
import (
"fmt"
"log"
"os"
"os/exec"
"time"
)
func main() {
ok, outString, errString := runBashCommandAndKillIfTooSlow("ls -la", 2000)
fmt.Println("ok")
fmt.Println(ok)
fmt.Println("outString")
fmt.Println(outString)
fmt.Println("errString")
fmt.Println(errString)
}
/*
run bash command and kill it if it works longer than "killInMilliSeconds" milliseconds
*/
func runBashCommandAndKillIfTooSlow(command string, killInMilliSeconds time.Duration) (okResult bool, stdout, stderr string) {
fmt.Println("running bash command...")
fmt.Println(command)
cmd := exec.Command("sh", "-c", command)
cmd.Stdout = os.Stdout // cmd.Stdout -> stdout
cmd.Stderr = os.Stderr // cmd.Stderr -> stderr
okResult = true
err := cmd.Start()
log.Printf("Waiting for command to finish...")
done := make(chan error, 1)
go func() {
done <- cmd.Wait()
}()
select {
case <-time.After(killInMilliSeconds * time.Millisecond):
if err := cmd.Process.Kill(); err != nil {
log.Fatal("failed to kill: ", err)
okResult = false
}
<-done // allow goroutine to exit
// log.Println("process killed")
case err := <-done:
if err != nil {
log.Printf("process done with error = %v", err)
okResult = false
}
}
if err != nil {
log.Fatal(err)
okResult = false
}
return
}
顺便说一句，如果 bash 命令太慢（killInMilliSeconds参数），程序应该保持其杀死 bash 命令的能力。
青春有我
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