FreeBSD user joining your ranks. I've been asked to look after an Ubuntu Server running 10.04 LTS.
I see from /usr/lib/update-notifier/update-motd-updates-available that there are a number of updates on the server however I do not see a way to tell which will be updated.
Would anyone be able to point me in the right direction so as I can see which packages will get updated when I run apt-get upgrade?
UPDATE:
Can't answer my own question at the moment so throwing this in here for the time being:
Along with the apt-get upgrade --dry-run suggested below, /usr/lib/update-notifier/apt-check -p will list all packages that have updates available.
4 Answers
As of now (Ubuntu 16.04) you can use apt list with the --upgradable flag;
sudo apt update
apt list --upgradableand you will get a list with all upgradable packages.
4You could install aptitude if it isn't already installed. It's a great tool for managing packages in a headless setup.
Otherwise if you just want to see what's going to happen when you run something, use the --dry-run argument and it won't actually do anything, it'll just tell you what it would do:
From the apt-get man page
-s, --simulate, --just-print, --dry-run, --recon, --no-act No action; perform a simulation of events that would occur but do not actually change the system. Configuration Item: APT::Get::Simulate. Simulate prints out a series of lines each one representing a dpkg operation, Configure (Conf), Remove (Remv), Unpack (Inst). Square brackets indicate broken packages with and empty set of square brackets meaning breaks that are of no consequence (rare).
Add the option to the command this way
apt upgrade --dry-runBelow command will show you the list of installed packages which has an update available in the repositories.
dpkg --get-selections | xargs apt-cache policy {} | grep -1 Installed | sed -r 's/(:|Installed: |Candidate: )//' | uniq -u | tac | sed '/--/I,+1 d' | tac | sed '$d' | sed -n 1~2pAnother alternative would be to use aptitude with a search term:
aptitude search '~U'(Note the uppercase 'U')
That means: "search for all packages that are installed and can be upgraded". Reference: aptitude user's manual
By default, aptitude search shows for each package its name, description and a few flags, but you could also adapt the output to your needs. For example, to list only the package names, the command would be:
aptitude search -F '%p' --disable-columns '~U'(--disable-columns avoids padding whitespace at the end of the lines)
