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- [Narrator] In this
video, I wanna tell you how

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the rpm command still can be useful.

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In the past, rpm was used
for package installation.

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Nowadays, really, you
shouldn't be doing that anymore

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because it's not taking
care of any dependencies.

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However, rpm is still useful for queries.

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You can query the rpm database,

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and you can query individual packages.

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For instance, you can use
rpm -qf to find the package

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where a file is coming from.

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And that is useful if you
know which file you need

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to update, but you don't know the package

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that belongs to the file.

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And once you've found the
package, you can use rpm -ql

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on that package to query the rpm database,

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to list the package contents.

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It can also be useful to
query the package file

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instead of the package contents.

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And if you wanna do that
you add a p to the options.

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Like rpm -qpc in a
package. which will list

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configuration files in the
downloaded package file.

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Or a very important one, rpm -qp --scripts

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on a package.

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That will show you
installation scripts that are

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in the package.

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And as you know, the
packages are installed

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with root privileges.

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You might want to check out
the contents of the package

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before actually running
the root based insular.

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Let me demonstrate.

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So let me start with pseudo rpm -qf

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on which ifconfig.

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That's a nice one.

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You remember, ifconfig
the obsolete command?

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ifconfig is coming from Net Tools.

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So what else do we have in Net Tools?

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Well, pseudo rpm,

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- ql Net Tools.

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If you query packages
you don't have to install

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the version information.

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Just the package name is enough.

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And now we can see that's kind of a lot

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so I need to use a graph to
filter it down a little bit.

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Let me graph on bin so that
we only can see the binaries.

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So here are the other deprecated packages

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from the Net Tools package.

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So that's convenient because now we know

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that we can use pseudo
dnf or remove Net Tools.

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I would always verify the
contents of the package

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before you are actually
going to remove it.

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And that's done.

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We don't have IF conflict anymore. Right.

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The package file queries.

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Let me use ls on *rpm
because I have a couple

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of rpms and I wanna work with virtio win.

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So rpm -qpc, the p is
for package file, so this

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allows you to query a package file.

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The c is for configuration
and oh we can see

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there's no configuration files in there.

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Well, you know what.
Let's do, let's do a qpl

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and there we can see
everything in this package.

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And that allows you to verify
the contents of a package.

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Now packages typically are installed,

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and very often there's
an installation script.

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And if you want to see what is

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in that script use
--scripts. Nothing in there?

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Okay, let's see if there's
an installation script

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in another one.

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Maybe we should use pseudo URL downloader.

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URL downloader is what you can use to

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download individual packages.

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And I want to download
a package that contains

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a service like vsftpd.

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Services normally do have
an installation script.

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So let's check if that is really the case.

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rpm -qp --scripts on vsftpd.

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And there we go.

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Here you can see the
scripts that are provided.

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So there's a post-install
and a pre-uninstall.

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And is there anything
else, a post un-install?

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The thing here is that
if we have a post-install

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that's all very nice

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but this script will be
executed with root privileges.

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So you really wanna make
sure that there is nothing

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happening in the script
that you don't like.

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And that is how rpm queries come in handy

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every now and then.