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How does the shell module work in Ansible?
The Ansible Shell Module allows you to run arbitrary commands on a remote host, just like you were logged into the shell.
How to run a shell command in check mode?
I’m using the shell command ( git rev-parse HEAD) to register the variable and then print/debug it but ansible skips shell commands in check mode. Is there anyway to mark a shell command as safe to run in check mode?
How to change the shell used to execute a command?
Change the shell used to execute the command. This expects an absolute path to the executable. The shell module takes a free form command to run, as a string. There is no actual parameter named ‘free form’. See the examples on how to use this module.
What’s the difference between a shell and a command module?
The Shell and Command modules are very similar, the major difference being that the shell module does not escape commands, allowing you to use shell operators like redirects (“greater than”, “less than”), pipe (“|”) and boolean operators (“&&”, “||”).
One of the most useful features of Ansible is its ability to run ad-hoc commands on remote computers with the Ansible shell module. The shell module allows you to run ad-hoc commands or even small scripts like you’re sitting in front of the local console of each machine.
What happens when stderr is returned in Ansible?
Some modules execute command line utilities or are geared for executing commands directly (raw, shell, command, and so on), this field contains the error output of these utilities. When stderr is returned we also always provide this field which is a list of strings, one item per line from the original.
Can a key be added to a registered variable in Ansible?
These keys can be added by modules but will be removed from registered variables; they are ‘consumed’ by Ansible itself. This key should contain a dictionary which will be appended to the facts assigned to the host.
When does Ansible stop execution if grep is not zero?
Like you observed, ansible will stop execution if the grep exit code is not zero. You can ignore it with ignore_errors. Another trick is to pipe the grep output to cat. So cat exit code will always be zero since its stdin is grep’s stdout. It works if there is a match and also when there is no match.