targets:
  changing:
    input:
      - cmd_stdout: date +%N
    output:
      - paths: [changing_output.txt]
    build: date +%N > changing_output.txt

  stable:
    input:
      - cmd_stdout: echo $SHELL
    output:
      - paths: [stable_output.txt]
    build: echo $SHELL > stable_output.txt