in src/main/scala/com/twitter/iago/launcher/Launcher.scala [112:121]
def runCmdWithConfirmationOrAbort(cmd: Seq[String], prompt: String, errorMsg: String): Unit = {
if (yes.isDefined || {
print(s"$prompt ")
scala.io.StdIn.readBoolean
}) {
runCmdWithExitOnError(cmd, errorMsg)
} else {
exitOnError("Aborting...")
}
}