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I have plenty of softwares installed on my Linux machine (RHEL) and some were installed with yum, some other by downloading a rpm and executed it from gnome file manager. I also have few softwares archives (zip or tar) I just unzipped in the /opt directory.

My question is: is it possible to know by which method I installed e.g the chrome browser which is located in /opt/google/ folder?

The answer can be different by Linux distro, but I am more interested for these distros: RHEL, CentOS, Fedora (sorted by importance).

The answer is enough for me if I can know: it was installed by yum, rpm or zip.

I checked the history (for both my own user and for root) but there is not traces there anymore.

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rpm -qa --last is an easy way to find out when certain software was installed from RPM.

rpm -qf /path/to/some/software is pretty reliable to determine if the software was installed from RPM and which RPM (unless that is a symbolic link).

If it wasn't installed by RPM the software came to your system in "some other way".

Whether of not the RPM package came through a yum repository, or not: yum info <rpm-name> displays from which repository the RPM package is available. If the yum repository is now disabled or the RPM package was installed manually yum will list: Repo: installed.

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