exec_run.go

package main

import (
	"fmt"
	"os"
	"os/exec"
)

func main() {
	cmd := exec.Command("sh", "-c", "ls | fzf")
	cmd.Stdout = os.Stdout
	cmd.Stderr = os.Stderr
	// it works as expected.
	if err := cmd.Run(); err != nil {
		fmt.Println(err)
	}
}

timeout_run_context.go

package main

import (
	"context"
	"fmt"
	"os"
	"os/exec"
	"time"

	"github.com/Songmu/timeout"
)

func main() {
	cmd := exec.Command("sh", "-c", "ls | fzf")
	cmd.Stdout = os.Stdout
	cmd.Stderr = os.Stderr
	tio := &timeout.Timeout{
		Cmd:        cmd,
		Duration:   10 * time.Second,
		KillAfter:  5 * time.Second,
		// Foreground: true,
	}
	// it doesn't work as expected.
	exitStatus, err := tio.RunContext(context.Background())
	fmt.Println(exitStatus, err)
}