Linux
How to upgrade a single package using apt-get?
apt-get install --only-upgrade <packagename>
How to prevent updating of a specific package?
Hold a package:
sudo apt-mark hold <package-name>
Remove the hold:
sudo apt-mark unhold <package-name>
Show all packages on hold:
sudo apt-mark showhold
### To downgrade you have to do a command like
sudo apt-get install pkg_name=version
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How do I check if a package is installed on my server?
Apt list - list of all installed packages
apt list <package> -specific package
If installed it'll print something like (with [installed] at the end of the line):
$ apt -qq list awscli awscli/stable,now 1.4.2-1 all [installed]
If not installed the output will be:
$ apt -qq list awscli awscli/stable 1.4.2-1 all
Dpkg -l | less