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matti / pty_spawn_stderr_stdout.rb
Created June 23, 2017 08:14
Separates Ruby PTY spawn stderr from stdout
require "pty"
stderr_reader, stderr_writer = IO.pipe
args = ["-c", "read a; echo was: $a; echo err:$a >&2"]
stdout,stdin,pid = PTY.spawn("/bin/bash", *args, err: stderr_writer.fileno)
stderr_writer.close
stdin.puts "hello"

Beautiful Bash

until something is true

if "creation" command fails, sleep 1

while true; do
  kubectl get namespace mynamespace && break
 kubectl create namespace mynamespace || sleep 1