What is a shell module?
The shell module takes the command name followed by a list of space-delimited arguments. It is almost exactly like the command module but runs the command through a shell ( /bin/sh ) on the remote node. For Windows targets, use the win_shell module instead.
Which shell does Ansible use?
By default, the shell module uses the /bin/sh shell to execute commands, but it's possible to use other shells such as /bin/bash by passing the executable argument.
What is the difference between Command and shell module in Ansible?
The shell module in Ansible is used to execute all Shell commands against the target Unix-based hosts. The shell module executes commands in nodes or Shell scripts. In the command module, the given command executes on all selected nodes. The executed command will not be processed through the shell.
Ansible can perform the function of not only setting up your systems, but also testing them for correctness. By contrast, a shell script can be very dangerous to run more than once unless you're extremely careful and know exactly what every line does. Note: The Ansible script can be improved.
discrete units of code
Ansible contains a giant toolbox of built-in modules, well over 750 of them.
With the pipe character you pass a value to a filter. There are numerous Jinja 2 filters but Ansible brings some additional filters. The term filter might be confusing at times because all the filters work very differently.
Ansible set_fact is a useful tool. This helps you to gather information from your remote hosts and adds the flexibility of modifying it before assigning it. Also, you may acknowledge that if you have a lot of hosts to be managed by Ansible, then working with set_fact is quite complex.
If you want to run multiple tasks in a playbook concurrently, use async with poll set to 0. When you set poll: 0 , Ansible starts the task and immediately moves on to the next task without waiting for a result. Each async task runs until it either completes, fails or times out (runs longer than its async value).
Note. This module is part of ansible-core and included in all Ansible installations. In most cases, you can use the short module name raw even without specifying the collections: keyword.