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How can I make Ansible execute a shell script if a (rpm) package is not installed? Is it somehow possible to leverage the yum module?
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You shouldn't be using
dpkg -l packagebecause it has no idea if your package has been removed or is still installed.Instead it's probably better to use
dpkg -s package.To check if the package is installed :
-
shell: dpkg -s package | grep 'install ok installed'or if you don't mind the package on hold or other states :
-
shell: dpkg -s package | grep 'installed'This return 0 when installed and 1 if not.
(It's important to use the shell as we are using a pipe
|)