[SOLVED] How to see what packages depend on a specified package?

trusktr · 2010-11-12 19:48:02

I want to list all the packages that depend on QT. Is there a command for this?

If not, i think it'd be useful to have something like pacman -Qr package-name to list packages that depend on package-name (Like in the "Required By" section of http://archlinux.org/packages/extra/i686/qt/)

Last edited by trusktr (2010-11-12 20:38:06)

Mr.Elendig · 2010-11-12 19:53:38

pacman -Qi qt
pacman -Sii qt

worksforme(tm)

GRem · 2010-11-12 19:54:46

pacman -Qi <package name> will list the information that the packages site shows, including "Required by".
Running it for qt shows me acetoneiso2, smplayer and scribus in said field, for example.

Is this what you need?

trusktr · 2010-11-12 20:36:26

Aha! GRem and Mr.Elendig, i just noticed that pacman -Qi package-name shows only the packages that depend on "package-name" only if they're installed in your system!

I think this is true because GRem, you said yours shows acetoneiso2, smplayer and scribus in the Required By field, but mine doesn't show any of those three. Mine shows "hedgewars lib32-qt lmms qjackctl qtractor telepathy-qt4", which are all installed on my system.

What a nice little discovery. So, here's a possible command to output only packages that depend on a given package (qt in this example):

pacman -Qi qt | grep "Req" | sed -e 's/Required By    : //g'

Works beautifully!

Last edited by trusktr (2010-11-12 20:58:33)

karol · 2010-11-12 20:37:03

I second Mr.Elendig - 'pacman -Sii qt' is what you need.

trusktr · 2010-11-12 20:40:47

Yeah, indeed the -Sii command shows all packages that require qt. I was looking just for the ones on my system. In this case -Qi did the trick, and i was able to extract them with the above command.

Last edited by trusktr (2010-11-12 20:51:35)

karol · 2010-11-12 20:43:47

trusktr wrote:

Yeah, indeed the -Si command shows all packages that require qt. I was looking just for the ones on my system. In this case -Qi did the trick, and i was able to extract them with the above command.

So you don't really want something like http://archlinux.org/packages/extra/i686/qt/. Oh well, glad you found what you need.

trusktr · 2010-11-12 20:52:02

Well either way in each scenerio you can isolate just the packages:
For system-installed packages:

pacman -Qi qt | grep "Req" | sed -e 's/Required By    : //g'

And for all repo packages:

pacman -Sii qt | grep "Req" | sed -e 's/Required By    : //g'

kohtogeiya · 2016-12-19 11:32:12

For posterity and all that, I'm replying to this 6 year old post.

At the time the above posts were probably the best answer, but now there exists a nice tool to directly extract data from pacman's alpm database instead of grepping and sedding stdout. The tool's called expac and in OP's case could be used like below if the qt package still existed:

$ expac -S %N qt

or if you only wanted to get local dependencies:

$ expac %N qt

WorMzy · 2016-12-19 11:55:08

Thanks for sharing, kohtogeiya, but please note that expac is extensively documented on the pacman tips and tricks wiki page already. You don't need to resurrect long-since-solved topics to update them.

Closing.

Arch Linux

#1 2010-11-12 19:48:02

[SOLVED] How to see what packages depend on a specified package?

#2 2010-11-12 19:53:38

Re: [SOLVED] How to see what packages depend on a specified package?

#3 2010-11-12 19:54:46

Re: [SOLVED] How to see what packages depend on a specified package?

#4 2010-11-12 20:36:26

Re: [SOLVED] How to see what packages depend on a specified package?

#5 2010-11-12 20:37:03

Re: [SOLVED] How to see what packages depend on a specified package?

#6 2010-11-12 20:40:47

Re: [SOLVED] How to see what packages depend on a specified package?

#7 2010-11-12 20:43:47

Re: [SOLVED] How to see what packages depend on a specified package?

#8 2010-11-12 20:52:02

Re: [SOLVED] How to see what packages depend on a specified package?

#9 2016-12-19 11:32:12

Re: [SOLVED] How to see what packages depend on a specified package?

#10 2016-12-19 11:55:08

Re: [SOLVED] How to see what packages depend on a specified package?

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