}

var helperCommandUsed sync.Map

var helperCommands = map[string]func(...string){
	"echo":          cmdEcho,
	"echoenv":       cmdEchoEnv,
	"cat":           cmdCat,
	"pipetest":      cmdPipeTest,
	"stdinClose":    cmdStdinClose,
	"exit":          cmdExit,
	"describefiles": cmdDescribeFiles,
	"stderrfail":    cmdStderrFail,
	"yes":           cmdYes,
	"hang":          cmdHang,
}

func cmdEcho(args ...string) {