Method Exec

script.go:429–454

Exec runs cmdLine as an external command, sending it the contents of the pipe as input, and produces the command's standard output (see below for error output). The effect of this is to filter the contents of the pipe through the external command. # Environment The command inherits the current pro

(cmdLine string)

// pipe, along with its standard output. However, the standard error text can
// instead be redirected to a supplied writer, using [Pipe.WithStderr].
func (p *Pipe) Exec(cmdLine string) *Pipe {
	return p.Filter(func(r io.Reader, w io.Writer) error {
		args, err := shell.Fields(cmdLine, nil)
		if err != nil {
			return err
		}
		cmd := exec.Command(args[0], args[1:]...)
		cmd.Stdin = r
		cmd.Stdout = w
		cmd.Stderr = w
		pipeStderr := p.stdErr()
		if pipeStderr != nil {
			cmd.Stderr = pipeStderr
		}
		pipeEnv := p.environment()
		if pipeEnv != nil {
			cmd.Env = pipeEnv
		}
		err = cmd.Start()
		if err != nil {
			fmt.Fprintln(cmd.Stderr, err)
			return err
		}
		return cmd.Wait()
	})
}

// ExecForEach renders cmdLine as a Go template for each line of input, running
// the resulting command, and produces the combined output of all these