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mattb avatar Ubuntu

List dependencies of package that I don't already have installed?

in flag
mattb

I want to know ahead of time how many extra packages need to be installed for a given package. I know I get something like this when I do an apt install -s package | grep ^Inst, but can I get the same info using the apt-cache command without needing to grep the output of the simulated apt install command?

I know I can show a list of dependencies for a package with the command:

apt-cache depends package-name

and I know I can limit that list to only those dependencies that I have already installed on my system with:

apt-cache depends -installed package-name

but how can I list only the dependencies that I don't yet have installed on my system? Something akin to:

apt-cache depends -uninstalled package-name
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hr flag
steeldriver
The tricky thing here is that if a (direct) dependency *is* installed, then you know all of its sub-dependencies must also be installed. However if a (direct) dependency *isn't* installed, you don't know which other sub-dependencies may be required without recursively traversing all the way down.
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Raffa avatar Ubuntu
jp flag
Raffa

In layman's terms :)

You can find dependencies, recommends and suggests for a package like so:

apt-cache depends package-name

You can limit it to dependencies only like so:

apt-cache depends package-name | awk '/Depends:/ {print $2}'

You can check installation status of these dependencies like so:

apt-cache depends package-name | awk '/Depends:/ {print $2}' | xargs apt list

You can print only uninstalled dependencies for a package like so:

apt-cache depends package-name | awk '/Depends:/ {print $2}' | xargs apt list | awk '!/installed/ {print}'
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