Thanks for your reply Vladimir Botka.

This is my actual case:

 defaults > main.yml
---
# defaults file for redis_configs
redis_config_path: /etc/redis/redis.conf

# Default Params Values
MAX_MEM: 3000
TCP_KEEPALIVE: 0
TCP_BACKLOG: 511
MAX_CLIENTS: 15000
TIMEOUT: 1500


And this is: 

Tasks > main.yml

---

- name: "Update Redis Parameters in {{ redis_config_path }}"
  lineinfile:
    path: "{{ redis_config_path }}"
  backrefs: yes
  regexp: "{{ item.regexp }}"
  line: "{{ item.line }}"
  with_items:
    - { regexp: '^maxmemory', line: "maxmemory {{ MAX_MEM }}mb", when: {{ 
MAX_MEM }} is defined } 
    - { regexp: '^tcp-keepalive', line: "tcp-keepalive {{ TCP_KEEPALIVE 
}}", when: {{ TCP_KEEPALIVE }} is defined }
    - { regexp: '^tcp-backlog', line: "tcp-backlog {{ TCP_BACKLOG }}", 
when: {{ TCP_BACKLOG }} is defined}
    - { regexp: '^maxclients', line: "maxclients {{ MAX_CLIENTS }}", when: 
{{ MAX_CLIENTS }} is defined}
    - { regexp: '^timeout', line: "timeout {{ TIMEOUT }}" } 


I want this to check if each variable inside an item is defined then make 
the changes to the line in the file, otherwise skip only those items which 
variables is not defined.
For Instance, If I comment out the variable MAX_MEM from the defaults > 
main.yml. like below:

# Default Params Values
##MAX_MEM: 3000
TCP_KEEPALIVE: 0
TCP_BACKLOG: 511
MAX_CLIENTS: 15000
TIMEOUT: 1500  

Then the execution should skip changes to the line where MAX_MEM is 
undefined, and the rest lines should be changed as they defined.

Is it possible?


On Friday, August 5, 2022 at 2:18:05 PM UTC+5 vbo...@gmail.com wrote:

> On Thu, 4 Aug 2022 23:43:59 -0700 (PDT)
> farrukh ahmed <farrukha...@gmail.com> wrote:
>
> > with_items:
> > - { regexp: '^text1', line: "text1 = {{ VAR1 }}", when: VAR1 is defined }
> > - { regexp: '^text2', line: "text2 = {{ VAR2 }}" }
> > - { regexp: '^text3', line: "text3 = {{ VAR3 }}" }
>
> Set *default* to avoid errors, add attribute *def*, and select lines.
> For example,
>
> shell> cat pb.yml
> ---
> - hosts: localhost
> gather_facts: false
> vars:
> lines:
> - regexp: '^text1'
> line: 'text1 = {{ VAR1|d("undef") }}'
> def: '{{ VAR1 is defined }}'
> - regexp: '^text2'
> line: 'text2 = {{ VAR2|d("undef") }}'
> def: '{{ VAR2 is defined }}'
> - regexp: '^text3'
> line: 'text3 = {{ VAR3|d("undef") }}'
> def: '{{ VAR3 is defined }}'
> tasks:
> - debug:
> var: item
> loop: "{{ lines|selectattr('def') }}"
>
> gives
>
> shell> ansible-playbook pb.yml -e VAR1=test
>
> PLAY [localhost]
> *********************************************************************
>
> TASK [debug]
> *********************************************************************
> ok: [localhost] => (item={'regexp': '^text1', 'line': 'text1 = test',
> 'def': True}) => ansible_loop_var: item item:
> def: true
> line: text1 = test
> regexp: ^text1
>
> -- 
> Vladimir Botka
>

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