Is there a way to output only the last five lines of an Ansible shell output, for example?
Maybe using loops?
Example:
- name: Running Migrations
ansible.builtin.shell: /some-script-produces-lot-of-output.sh
register: ps
- debug: var=ps.stdout_lines
The debug task should only output the last five lines.
You can use Python's slicing notation for this:
- debug:
var: ps.stdout_lines[-5:]
Will output the 5 lines from the end of the list (hence the negative value) up until the end of the list.
Given the tasks
- shell: |-
for idx in $(seq 1 10)
do
printf "line%d\n" "${idx}"
done
register: ps
- debug:
var: ps.stdout_lines[-5:]
This yields:
TASK [shell] ******************************************************
changed: [localhost]
TASK [debug] ******************************************************
ok: [localhost] =>
ps.stdout_lines[-5:]:
- line6
- line7
- line8
- line9
- line10