---
- name: sample shell out
  hosts: foobar
  remote_user: olbohlen
  vars:
    keyword: "10"
  tasks:
    - name: run a sample shell command
      shell: cal
      register: shell_out

    - name: debug shell_out
      debug:
        var: item
      loop: "{{ shell_out['stdout_lines'] }}"
      when: "keyword in item"